27 weeks loose

I'm 27 weeks pregnant, not with the dad but me and my first babydad are thinking of sorting things(this is my 2nd child) We was having sex then after he said he can tell I've had sex recently (I slept with him a few days before this) but he was implying with someone else and was laughing, he said I'm not going to say why but I can tell you've been with others. Me being me this made me feel insecure that my vagina is going loose, I know your body and bits stretch during pregnancy, so should he. I also Masterbate quite a bit with vibrator or dildo. How could I get my vag to feel a bit tighter or something?

I also didn't cum either of the times we had sex so it can't just be me doing something wrong. I would never ever say something along the lines that would make someone feel insecure after or during sex.