idk for the title, I just need help.

Me and my child's father are very close. So when I told him I was pregnant he was happy and told all his boys. One of his boys which so happen to also be my brothers best friend that I've known for years . Got jealous cuz he had a crush on me for the longest but I didn't see him that way. A week after I found out he raped me. And came in me. Saying it's supposed to be his child. After it happened I called my child's father crying and told him what happened. I'm now 10weeks and my child's father and I want to know if it's possible that his friends sperm somehow got into the egg and became his ? I'm nervous to ask my doctor but The Internet is telling us it's not possible because the egg seals off as soon as the Sperm enters. Is that true? Cuz even if it's the slightest possibly. I won't keep the baby.