I have name changed for this post, I am not a troll I promise!
My younger brother who is 21 and autistic has been in his first ever relationship for the past few months. For some context me and my brother have a very close relationship so coming to me for advice like this is completely normal for us. So after seeing him over Christmas he told me that he is terrified of his girlfriend getting pregnant. He assured me that his girlfriend is on the pill and he wears a condom every time they have sex but he has bad anxiety over an accident happening.
Brother thinks he is being reckless as he admitted to me that him and his girlfriend have been having quite a lot of sex and my brother has got it in to his head that the amount of sex they are having an accident is bound to happen and it is inevitable.
I told him that the only way who can 100% be sure not to get pregnant is just not have sex at all, however I told him that he's not being reckless and to not worry as long as you wear a condom and his girlfriend is taking contraception and enjoy being young and in a relationship with his girlfriend who he is very happy with.
I don't really know what my AIBU is, I'm just a bit worried that if my brothers girlfriend falls pregnant while they are using protection he will say he knew he should not have had sex. I'm not saying he would blame me at all but my brother would be massively upset with himself for being what he would see as being "reckless".