A woman's desire to or not to have sex during pregnancy is hormonally related to a certain extent, but it's environmental as well. It depends on the relationship and the stresses that they have at work, and whether the pregnancy was a planed pregnancy or not. So there are a lot of external factors that come into play when someone has a desire or doesn't have a desire to have sex. Understand that whatever you're feeling is normal and communicate with your partner. And if the two of you are on the same page, then it's a good thing. If you're not on the same page, then maybe bring it up with your doctor about how one of you wants more than the other and how to address that.