Why do I never orgasm??

Adriana
Ok so I have a sex question. I've been with my husband for 5 years and we're on baby number three. Our sex life is a bit on hold right now cause I'm pregnant and it hurts and we two babies. But when it isn't on hold it's great! But one thing him and I are curious about is why do I never orgasm? He orgasmns every time, but I never ever do. I've never had one before. The sex is nice, so doesn't that mean I should orgasm? Any advice or input?