There's not a lot of evidence that I know of (i work in a related field). In general, to test positive through secondary exposure is considered technically possible but you'd hafta breathe so much in such a small space for a really long time that it doesn't really happen. Any kind of smoke, first or second hand, damages the lungs so there's that. but no to your original question.
No, a drug test and the baby's meconium stool will not test positive if you are not personally smoking or ingesting in the THC. There is very lukewarm research currently available about the effects of Marijuana second-hand smoke (the ones that give clear-cut answers are usually opinionated and not scientifically credible); but just to be safe, stay clear when you can. Good luck mom!
If he is smoking in the same room as you. You are still breathing it in its not good for you or your baby.
I have never smoked but my partner does he never smokes around us but.
I used to live in a flat top flat the guy under me his ceilings had holes in so everytime he smoked it would come up in our flat I didn't ever think it would harm our baby I was pregnant at the time but when my son was born the midwife turned round and asked me if I smoked I said no my son turned blue and had a bad infection But is 100% now.
all I am saying is be careful it really does harm your unborn baby.