HELLPPP!!

Ok please don’t judge I understand I’m wrong. Ok so im 17 and I’m a mother of a 1 month and 2 Days old baby well I decided to stop pumping milk because I was going back to school and it would be hard to pump at school well I stop pumping milk and switched him to formula the proper way and tonight my mother told me I need to go pump well before that I smoked weed and I honestly didnt know I would be pumping milk again & no when I was breastfeeding i was not smoking today was the first that I have smokes in a long time before I was pregnant . Please tell me what will happen to my baby