IS IT NORMAL FOR SPERMS TO COME BACK FROM THE VAGINA AFTER S

Hello, me an my boyfriend of 6 months had anal sex and he cam inside me. So far there hasn't been an semen pushed out, I'm gone to the bathroom but nothing I've noticed. I pushed again somthing like semen but yellow came out. It smelt the same as cum aswell. Should I be concerned or is this semen? I'm nervous

but what r you worried about that you could have an std/ how long ago did you have anal sex