i feel withdrawn...especially from my baby's father...

First off, yes. It's completely normal. Your hormones are all over the place right now and you aren't your normal self. That said, you'll just have to wait and see how things go throughout the rest of your pregnancy. Your hormones change a lot as your baby develops and it's common for these weird side effects to change as well. But, there are women who don't have sex and don't want to be near their husband/fiance/etc. for the entire pregnancy. A friend of mine had to move in with her mom because her husband's smell made her incredibly sick. I have a couple of friends who just don't have sex during pregnancy. Pregnancy affects women differently, there's no way to tell how things will be for you.

The best thing to do is to talk openly and honestly with your fiance about what you're going through. You don't have to give him answers or timelines for things, just let him know how you're feeling. Don't stress about it, that will only make you feel worse. Just go with the flow, no matter what that flow is. In all honesty, you can't fight your hormones or the effects they have on you.