Believe it or not, in addition to the day you actually ovulate, you’re most likely to get pregnant if you have sex in the five days or so before. Here’s why: Once the egg leaves your ovary, your guy’s sperm has about 12 to 24 hours to get to it for conception to happen. But sperm can actually remain viable inside you for several days or even weeks after you two actually get it on. So to put it bluntly, the more swimmers you’ve got in there ahead of time, the higher your odds are of making a baby.