Pot postpartum or breastfeeding

Hey y'all! I have a question for all the mom's. I had tested positive for thc in my first trimester but stopped and was clean the rest. My OB said they would only do something if I tested positive in my 3rd trimester.

So I had my daughter on the 10th and have a follow up appt for myself due to preeclampsia on the 16th.

I had told them I was breast and bottle feeding. But due to jaundice and weight loss Ive been formula feeding her and just pumping.

So I had wanted to start smoking again for the pain but im worried they will blood test me at my appt on Thursday or at my 6 weeks.

Was anyone blood tested?

Or was baby tested at later appointments?