Just move on from it. (Easier said than done, I know). It was an understandable "mistake" to make. Hold your head high and don't let him make you feel cheap because you are most certainly not. You're actions are understandable, like I previously said. You are carrying his child. What is his excuse for acting like a prick? (Sorry for the term about the father of your child, he is acting like one but that doesn't mean he is, so sorry).
My point is, he should be treating you like a queen, that's right, queenbeach. You are carrying his lineage, his fruit, you will raise the continuation of his genes! You're amazing.
You're planning on doing this by yourself and I am 8 months into this doing it alone with your fist child thing and I can tell you that whist it is undoubtedly the hardest, everlasting, never ending task you will ever embark on, (please God) it is also the most rewarding and worthwhile one...is it your first child or first child with your ex? Either way, it's tough and if not your first child then you are well aware of what I mean!
All I am really saying is you're doing so well, don't beat yourself up for being a completely normal woman with a beating heart, red blood and feelings. He may actually not be acting like a prick and may just feel awkward.. I really don't know so I shouldn't comment in that regard but my main focus is on getting through to you that you should not be worrying yourself over what happened. Nurture yourself. You have a beautiful life growing inside of you and that little life is wreaking havoc with your emotions right now so please, go easy on your lovely self and relax.
At least you're still desireable and sexually appealing! Tweak your perspective on it and try to laugh about it.
Take each day as it comes.
That was the best advice I was given, by my mama, when I was pregnant and it keeps me going now too.
Lots of love, queenbeach.x.