Need advice or reassurance

Ive never had anyone to confide in about sex and so i freak myself out about certain things and have nowhere to turn. I love sex and my partner is amazing about everything but whenever something happens that is a bit gross it makes me feel revulting and i get really self conscious. Today there was discharge on the duvet when we finished having sex, he wore a condom and i was on top so it had to be me but I dont know what it is or whether its normal and it just makes me hate myself. Is this normal? Im scared that his ex (only other person he has slept with) never had anything like this and so im just disgusting to him. Please help me, i feel so self conscious and upset, i dont know what is going on with my body and what is normal and what is not? Im mid 20s so its so humiliating having to ask these questions. Thanks in advance