Need help orgasming!!!

My boyfriend and I were having sex today and I was close to orgasming, I know it because I felt it in my tummy but when I was about to (this would've been my first time) I felt like I was about to pee. Is this normal? That's why I wanted to stop, because I thought I was going to pee but idk what to do. It seems like every time I'm about to finally orgasm it never happens. Maybe I've orgasmed and I havent realized it.