The answer to your question is ...yes, pregnancy does elicit flashbacks,memory return and lots of other inexplicable, possibly dysfunctional responses in survivors. I only perceived this in retrospect because my husband's memory of his abuse did not surface for another 17 years after the birth of our first child. It was a very difficult time and I believe that it was one of those times when it was just possible that his memories could have surfaced but sadly, he was not yet ready. So, be thankful that your husband is beginning to remember because repression is so much worse.
That being said, your prime directive now is the well being of yourself and your baby. Be there for your husband when you can but be aware of your stress levels and apply all your deepest inner resources to nurturing yourself first.