Asap. I was @friends wedding party, smalll crowded room, appears thatevery1was smoking &smoking bio weed, I left party in two hours, pregnant38weeks. Harm?

I think if that was . A one-time, 2-hour exposure at 38 weeks' gestation, you needn't fear harm to your fetus. But you may want to find a new circle of friends to avoid repeated exposures once your baby is born.
Not likely. Limited duration, single exposure, in third trimester is not likely to have any lasting effects. You can always ask your OB for their experience as well.