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Q&A: How long is each trimester?

When exactly does each trimester begin and end?

Re: When exactly does each trimester begin and end?

If you’ve tried searching the web to find out when each trimester begins and ends, you’ve probably noticed that there are many answers to this question. Different practitioners may use different markers to determine the start and end dates of each trimester. Some just break it up into three chunks of 13 weeks, but most add on an extra week for a grand total of 40 weeks of pregnancy. Here’s the most common breakdown:

First Trimester: Starts with the first day of your last menstrual period (LMP) and ends with the last day of the 13th week thereafter. During your last period (which will be your last for a while), your uterus is preparing for ovulation and your body is gearing up for pregnancy, so technically, you can start counting from this point.

Second Trimester: Starts at the beginning of the 14th week after your LMP and lasts through the 27th week of pregnancy.

Third Trimester: Starts at the beginning of the 28th week after your LMP and ends with labor.

>> Still confused? Use our Due Date Calculator tool help pinpoint which trimester you're in based on your estimated due date.

Jayme Klock | June 01 , 2009 2:15 PM

Q: When does morning sickness go away?!

When does morning sickness start to go away or does it ever go away?

| April 27 , 2009 10:47 AM

re: Q: How long is each trimester?

Morning sickness, generally speaking, goes away after the first trimester. I'm at 23 weeks right now and I feel pretty great on that front. Be warned though, I've been told that goodness only lasts through the second trimester. After that, the first trimester "nasties" (as my doctor referred to them) return with a vengence.

MEGrover | April 30 , 2009 8:38 AM

Q&A: How long is each trimester?

2 months

jmarrero1124 | March 07 , 2010 6:59 PM

Q&A: How long is each trimester?

If each trimester was 2 months, you would only be pregnant a total of 6 months.

moandro | March 30 , 2010 1:39 PM

Q&A: How long is each trimester?

I think she meant morning sickness goes away at 2 months... and actually I think everyone is different.

steviware | May 11 , 2010 12:56 PM

Q&A: How long is each trimester?

They normally say after 16 weeks you should start feeling some relief.. But like steviware said, it can be different for everyone..

JulietBair | May 11 , 2010 4:05 PM

Q&A: How long is each trimester?

it varies from woman to woman because i didnt have to deal with the morning sickness thank God, but not i'm dealing with heatbrun and im in my third trimester.

dionna10 | May 21 , 2010 12:35 AM

Q&A: How long is each trimester?

yes

zira07 | June 04 , 2010 10:48 PM

Q&A: How long is each trimester?

I didn't have to deal with morning sickness either which was really nice. I am however occasionally getting heartburn but when they say you start feeling nasty again in your third trimester thats not true. I can say that you become tired again but as far as feeling morning sickness and all that no. However i have had a good pregnancy with no sickness and i have felt great throughout the pregnancy and i am 34 weeks. I excercise though too so that might be helpful if you feel crappy try walking 4 days out of the week.

batesgirl | July 09 , 2010 5:46 PM

Q&A: How long is each trimester?

my morning sickness hasn't gone away- im due oct 13 but my doctor gave a pretty good anti nausea pill to help with it- each trimester is about 3 months. i will be so glad when labor pain hits- it will be the end of a horrible pregnancy- i even had to stop working due to the sickness- hope everyone else is doing ok.

dclsboo235 | July 12 , 2010 2:32 PM

Q&A: How long is each trimester?

Im 24 weeks and morning sickness is still kicking my tail!!

jhwilliams98 | July 26 , 2010 6:11 PM

Q&A: How long is each trimester?

I had morning sickness from 5 weeks until about the beginning of the fourth month. My mom had no sickness when she was pregnant with me, but with my sister she was sick throughought her entire pregnancy up until the day she gave birth. So for this question there is no set time limit.

bburton90 | August 01 , 2010 1:54 PM

Q&A: How long is each trimester?

I only had it once during my first tri, and I thought it was smooth sailing.. however, I have been hit three times in the past week (I am 17w 3d)!! Has this happened to anyone else?

lhilts | October 11 , 2010 11:32 AM

Q&A: How long is each trimester?

I was always told each trimester is 13 weeks. As for morning sicknes, I'm 13 weeks, 4 days and throw up just about everything I eat. I've lost 15 pounds but I was about 10 pounds overweight when I got pregnant. I exercise to stay in shape but nothing intense. Walking to olong makes me dizzy and nauseaous. Also I've started seeing "white lights" like floaters when I throw up...anyone have that?

Jesstastic | January 16 , 2011 1:10 PM

Q&A: How long is each trimester?

Hi Jesstastic, yes I have the "white lights" when I throw up. I believe that is just from your electolytes being imbalanced when you throw up. This is my 3rd pregnancy. I was very sick with my daughter, had severe hyperemesis with my son, and like you lost 15-20 pounds in a couple months. This pregnancy is not too bad as far as vomiting goes, just sooooooo nauseated that I can barely stand it. I wouldn't be too concerned about the white lights, unless you are unable to drink barely anything ( had to go get an IV last night), or you feel very weak, or dehydrated. I can't wait to be done with this pregnancy, I am only 8 weeks and it allready feels like I have been pregnant so long!

twidmark | February 03 , 2011 4:02 PM

Q&A: How long is each trimester?

Luckily I've never experienced morning sickness but I have experienced motion sickness and heartburn. *A glass of almond milk seems to do the trick to rid myself of heartburn discomfort.* As for the motion sickness, I open the window, if I'm in a car or put my head down. DH and I were on a boat towards the end of my 1st trimester and it was an awful ride, even with my head down. I felt everything moving for the rest of the day and night after that hour and half boat ride.

elpida123 | March 05 , 2011 1:30 PM

Q&A: How long is each trimester?

I had way more morning sickness with my two girls then i did with my two boys! it seemed to last forever with the girls. I am 24 weeks right now and still have moments plus i have heartburn all night so hurry up edynn mommy is tired of being pregnant already lol

AnLeMamma46811 | March 29 , 2011 10:06 PM

Q&A: How long is each trimester?

I haven't had any morning sickness at all and I'm 15 weeks.

MISSD123 | June 07 , 2011 7:59 AM

Q&A: How long is each trimester?

12 weeks

Jess0820 | June 23 , 2011 11:28 PM

Q&A: How long is each trimester?

Luckily, for me, I've only gotten sick from eating the wrong foods. No morning barfs :-)

Jasfuentes | September 10 , 2011 4:42 PM

Q&A: How long is each trimester?

My sickness started around 5weeks I am now 12weeks feeling a lil better. Now im getting headaches,heartburn plus a stuffy nose smh I wish it hurry up and end so I can feel normal again......

Sexyville29 | October 06 , 2011 8:22 PM

Q&A: How long is each trimester?

If your doctor hasn't mentioned the following topics during your visits, he or she isn't purposefully omitting the information. More likely, your doctor hasn't brought them up because pregnancy affects women in different ways.-Any Lab Test Now

shantelle1109 | October 08 , 2011 7:36 PM

Q&A: How long is each trimester?

You have 3 trimesters so you can divide the time by 3, This will give you your answer. There is so much that goes into these trimesters. Load Cells

jb4522jb | November 13 , 2011 9:31 PM

Q&A: How long is each trimester?

I felt 100% better on day 1 of week 12 (still in my first trimester) but every woman is different!

totustuus11 | December 21 , 2011 10:26 AM

Q&A: How long is each trimester?

2-2.5 months limestone countertops

jonnymoss | December 21 , 2011 1:24 PM

Q&A: How long is each trimester?

3 months X 3 trimesters = 9 Total Months Pregnant!

Brooklyn Gal | January 24 , 2012 9:07 PM

Q&A: How long is each trimester?

I was told each trimester is 13 weeks but other references vary in the times. I do not think there is a definitive time for each trimester. Stokke Xplory Strollers

Cathy9250 | January 25 , 2012 9:12 AM

Q&A: How long is each trimester?

it differs from lady to lady because i did not have to cope with the day condition thank God, but not i'm interacting with heatbrun and im in my third trimester.

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mahaalikhan | February 04 , 2012 9:00 AM

Q&A: How long is each trimester?

it differs from lady to lady because i did not have to cope with the day condition thank God, but not i'm interacting with heatbrun and im in my third trimester.

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nabhajazz | February 04 , 2012 9:46 AM

Q&A: How long is each trimester?

I excercise though too so that might be helpful if you feel crappy try walking 4 days out of the week.

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nabhajazz | February 04 , 2012 11:19 AM

Q&A: How long is each trimester?

homecoming dresses They are basically three months each, but you should look out for other signals that a trimester is finishing or starting. quinceanera dress

ZacharyNewt | March 21 , 2012 6:28 AM

Q&A: How long is each trimester?

My morning sickness (all day sickness) left after my first trimester but im in my third trimester now and some times i feel yucky but no morning sickness. but i do feel tired alot

BransonsMommy | March 26 , 2012 8:03 AM

Q&A: How long is each trimester?

I've had morning sickness since 6 weeks, and it's steadily getting worse, and I'm 12 weeks now.

kaylaeck | May 10 , 2012 11:02 AM

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you asked...

Q&A: How long is each trimester?

Re: When exactly does each trimester begin and end?

Q: When does morning sickness go away?!

re: Q: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

Q&A: How long is each trimester?

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