Feeling so emotional today.

My mum has pcos and had major difficulty conceiving. It keeps cropping up in my head that "what if you can't give him kids", "what if I can't have children". It keeps getting me really down. When I try talk to my boyfriend about it all he says is "I'm not talking about this". I got tested for it when I was 16 but his mother got it when she was older. I also keep getting worried that his sperm won't stay in me for the few days it's alive. I'm currently 4 dpo and just want to test which also isn't helping.