If you are a doctor or nurse (especially in the OBGYN field) please give some insight

(Don’t read if you are easily grossed out)

This is probably a stupid question but I didn’t know where to turn since google wasn’t very helpful. I take the pill for my birth control every day and I don’t miss any. I’ve been on it for three years and I’ve never gotten pregnant despite having someone cum inside of me. I know that the pill isn’t 100% effective but is pretty reliable. Recently, I’ve been having sex with my boyfriend a lot. He cums inside of me and I’ve noticed that it’s a large amount. It’s like nothing I’ve ever seen before. After putting my leggings back on when we were done having sex, the cum that leaked back out soaked through them and ruined my underwear. I know that will sound gross to some so I apologize in advance. My question is, would the large amount of semen increase my chances of getting pregnant while on the pill? Does the amount of cum and how many times he cums inside of me affect the odds of it? I’m avoiding pregnancy and I DON’T want kids for a long time. Even though I take my pill everyday I’m still worried about it. Sorry if this sounds really uneducated.