Good Morning I'm A Mother One 1 And Another On

Good morning I'm a mother one 1 and another on then way. Im a single mother that suffers from depression bipolar and anxiety...and the only thing that will do to help my issue issmoking marijuana. Im NOW 5months pregnant and im a veryheavy smoker. I smoke 4 to 5blunts a day. IM afraid to stop but
I have to for the new baby...how can I? And if stop how long to be out OUR system? Please help