Can’t climax with condoms

I’m on the pill but I just like to be save we’ve had sex before a couple of time without a condom and every time he comes but when I say I want to use a condom this time he does but he can never come what are the best condoms for that and/or should I even be worried using no condom when I’ll on the pill.

Background info: I’m super super scared of getting pregnant and idk if I’m just being extra, but I’m on a combination birth control ( it stops ovulation and thins the lining in the uterus and thickens the mucus witch makes it harder for sperm to swim up.)