Itchy inside vagina after sex

Had unprotected sex with my boyfriend last night, and woke up really itchy inside my vagina where his penis has been!! Sorry to be graphic but I’m really worried. I’m pregnant, 16 weeks, He knows I’m allergic to condoms so could he be cheating and using condoms with someone else and then coming back to me, could he still have the condom effect on his penis even after a shower? I just find it weird, we have unprotected sex all the time but it’s never been this itchy after?? Thanks