I'm 32 Wks Just Quit Smoking Weed I Smoked Everyday

I'm 32 wks just quit smoking weed I smoked everyday but past few weeks only smoked a little how can I be clean before I have my son only smoke bc it helped me eat & my depression bc I Was on Xanax bc had anxiety real bad but my doctor stop once they knew I was pregnate and I also quit smoking cigarettes to but will I be clean by march 20