33 weeks 4 days can't orgasm is this normal?

Latoya • Excited and nervous pg with my son and a mother of an 8 year old daughter
Ok so at the beginning of my pregnancy I was so sick the thought of sex made me sick. We didn't start having sex again until about 27 weeks pg. I am always horny I can orgasm through masturbation but when he goes down on me or we have sex its a no go. Before I got pg I had no issues. Anyone else have or having this issue?