30 weeks and weed

If I take a hit or two of MJ will it be in my system by the time the baby is born? I have 69 days left. I've read it takes 30 days to get out of your system.. But i only need a hit or two. Not a lot. 
Any advice form 420 friendly mommas?
*no negative comments because I've done my research and there's no harmful effects - so don't waste your time trying to preach to me please!*