Yep sounds familiar! Had the same with my pregnancies. First pregnancy I got hit on so many times and I never expected it. Neither did my 'then boyfriend' because he went as far as dumping me after another argument and I just picked up on a few flirtations during my pregnancy which made him come back on hands and knees.
Second pregnancy the same I was pregnant to an older man he was married, kids even a grandchild and he said he didn't want to keep it and if I kept it he would dump me and never see me again so I said au revoir and went back in the dating pool!
Enjoy the extra attention is what I say!