thank you for your query. smoking marijuana has a lot of negative consequences like harmful effects on your lungs (chronic obstructive pulmonary disease
etc), brain (psychosis
, cognitive decline, amotivational syndrome
etc), fetus (congenital malformation).
however, it also has analgesic
effects for which it is often used in traditional/ indigenous methods of treatment.
if you are going for a medical termination of pregnancy, then your gynaecologist will give you medications for your pain relief and take care of your other problems.
I would not suggest smoking marijuana in this case if I were to see a patient with similar complaints as yours.
hope i've been able to satisfy your query. Please don't hesitate to contact me for any further clarifications if needed. wish you all the best.