Birth control and weed.

Well, tomorrow I'm finally getting the shot/depo because my periods are so bad that I'm extremely underweight and well my medical health isn't okay let's just say. 
I was wondering, if anyone knows, if you can continue to smoke weed whilst having this certain birth control. 
As, to me weed is a relief for my depression and also, it helps me write sins etc. Don't worry I don't do it a lot, like once every two weeks.