Opinions?

My fiance "fully" came in me last week. He normally comes a little then pulls out. I don't have any symptoms. I took a test and it was negative. I'm kind of afraid to know if I'm unable to get pregnant or if he's shooting blanks 😳 I don't want to go to the doctor and them tell me everything is normal. Is it all just in my head? I feel like I'm crazy and overreacting.