I think 3 days or something like that, but they are starting to test babies meconium, which will test positive if you have used past 20 weeks of pregnancy I believe (or it might be anything past 12 weeks). Either way, I hope if you are pregnant and using that you are on your way to recovery for your and your baby's sake. You CAN do it!! Let your doctor know asap, they should have resources available for you.
Truely hope you find a good support system
Idk how long but.if yu have been using it more than likely baby is already addicted and withdrawals for newborns are terrible...yu need.to let yer doctor know