I smoked weed thinking i had misscaried... help?

So I went and had an ultrasound thinking I was 7 weeks and all that they saw was an empty sack. That measured 5 weeks 4 days.. the doctor told me that it was most likely a "blighted ovum" which means the baby stopped developing:( so I went home crying so hard I couldn't barley breath, I stayed in my room sobbing I never been so sad, so my boyfriend rolled me a joint and I smoked it thinking "might as well" Im not a pothead btw this was extreme saddness I was feeling. Anyway I ended up smoking more throughout the weekend, thinking I wouls feel better (I didn't). Just today my OBGYN calls me and tells me my bloodwork looks GREAT and she is "optimistic" about my pregnancy. WTF do I do now?!! I feel like such a jerk I thought my baby was dead or not there but now there's a chance, did I ruin it? Will my baby have defects? Any advice? Anyone?