Sex position?

Hi ladies! My husband and I are officially trying to get pregnant with our second! Last night we did the deed. Maybe I am getting too far into my head, but I’m wondering if position and gravity has any chance of lowering your chances of getting pregnant??

I was on top of my husband and after he came, I got off and a lotttt of cum came out. This is where I wonder if it all came out and nothing got inside of me? 😅 typing it out I feel silly, but will this lower my chances since it all didn’t stay in??

TIA! ♥️