You wont not feel bitter. some people you'll really struggle with, others you'll be ok with. Regardless of the fact that you're currently pregnant. it doesnt make a difference.
There is no right or wrong way to feel in these kind of situations hun. Just go with what you're feeling, ride it out.
I'm always here to talk if you need to.
I understand where you're coming from completely and i actually have a post on BB virtually saying the same things.
Much love and many hugs xxx