Why do doctors check a bhcg (pregnancy) test if you've never had sex?

Pregnancy test: Unfortunately, some people may not tell the truth when it involves sex. Medical evaluation will involve completely different differential diagnoses depending on whether a patient is pregnant or not. The pregnancy test is a very important, painless and cheap test.

They don't trust you: Believe it or not, for various reasons, patients are not always honest with their physicians. So, sometimes when it it important to know for sure if someone could be pregnant, a physician will do a pregnancy test even when a patient claims to not be sexually active.