###Human: Is it possible to get pregnant after oral sex? ###Assistant: Hello. No, you can never get pregnant with oral intercourse only. Vaginal intercourse without precaution would lead to pregnancy during the fertile period. And the periods you are having is not because of pregnancy but may be because of hormonal imbalance. Get your thyroid profile and serum prolactin and fasting insulin FBS. Plus ultrasound to know the endometrial thickness. The birth control pill if you are taking, may result in this if taken irregularly.