No, you have to be specifically tested for the presence of THC. However, if you think you're pregnant, STOP putting anything in your body you wouldn't feed directly to a child.
- A simple blood test no. There are HUNDREDS of substances to check for, and unless there is a reason, a Dr. can't test for everything. A couple notes: If you are involved with any Child Protection Agency because of substance abuse, they will check. If you have a car accident, are the driver, and you are rolled into the E.R., the first thing they do is a drug screen: opiates, cannibas (pot), cocaine, alcohol, all the benzodiazapines (Valium, xanax etc..)
But for a normal average person going for a pregnancy test, that's all they check for.