Orgasms..... Can you tell?

Dajee • 20. Mommy. Biz major.
I can never tell if I have came or not, I just get super wet and his penis is filled with my juices, I know I cum on him plenty of times because when he first goes in its just wet but when we're finish his penis has white stuff on. How can you tell when your having a orgasm during sex? When he gives me head, licks my boobs and playing with her I know when I'm having a orgasm.