YABU because you gave away your PC and unsubscribed, knowing your DH was still playing! You are both having a child - theres no way you should give up everything and your husband nothing! You need to come to some kind of arrangement or you will just end up resentful and he will have to quit too.
That being said, unless you are desperately short on space, theres no reason why you can't still play after the baby is born. In fact, given you will be spending a lot of nights in with your baby just sleeping, its a good hobby to have.
After my DD was born I didn't raid for about 3 months. It took a while for her to get back into a routine and for me to be ready to play again. But now, admittedly with our raid times slightly adjusted, we raid three nights a week. Our guild is used to people having kids that need attention. They may have filled your raid slot right now, but things happen and I wouldn't be suprised if another became available.
We have both of our PCs set up in the living room. We brought these little cupboard desks from Next and nice rattan office chairs from Ikea that keep it looking tidy. This way we don't disturb DD. It took a while to figure out a good layout but it works well now.
I'm on Darksorrow btw and that has a good Alliance community (well, its got its share of idiots, but its also got some good people and its highly populated so you can just steer clear of those you don't like).