35wks pregers and morning sickness has kicking butt. Marijuana has seem to be helping. Will drinking a lot of water help it flush the babies system.

NO. THC is lipid bound, which is why it stays in your system for 30 days or more.
Quit now. In my state, the CFS newborn removals for drug exposure is up this quarter. If the authorities are aware you are pregnant and use, you are in for trouble. The facility only needs the babies first poo to show drug exposure going back at least 2 months. The urine may also be positive for weeks.