Would a doctor who is drawing blood from a patient for a pregnancy test detect...

[Kiwi]

i know when they draw blood, that they check for STD's and gestational diabetes. a pregnant person shouldnt be doing drugs or drinking anyway.

[Curious Girl [retired]]

...anything else in the blood? And could they? Like say, Blood alcohol content or even any drugs in the system, if they are purely looking to see if a patient is pregnant?

[Pangolin]

Blood is tested only for what is ordered by the physician. If a pregnancy test is ordered, the only result that we get is whether or not you're pregnant.

If a drug screen was ordered, then that other information would be available.