What Causes Bleeding In Vagina When Snorting Crystal Meth?

I ve been snorting Crystal Meth for a month now, every Friday. Since the first time I used it, a few hours later I began to bleed vaginally, although I had already had my period a week prior to me snorting it for the first time. I have been bleeding ever since, at times heavy and other times just spotting, but continuously nevertheless, and it s going on 25days now. My question is this, could it be the Crystal Meth causing the vaginal bleeding? If so, how does it go to work on starting the bleeding in the first place? And lastly how can I stop the bleeding? PS. I stopped using the Meth, but the bleeding continued.