Is Continuous Vaginal Bleeding Normal After Taking Depo-Provera Injections?

Ok,, I'm 20 yrs old.. I was on the deprovera birthcontrol shot for 2 yrs, 1 shot every 3 mths & one of the side affects of deprovera that I experienced was no Men. Cycles.. My last shot was given to me in November of 2008, Janaury of 2010 made a year for me being off birthcontrol & within that year I had no menstrual cycle. Well in february 2010 I began vaginal bleeding then stopped after a month & again in May 2010 I began vaginal bleeding again then stopped for a month.. & mid June 2010 I began vaginal bleeding for about 2 weeks & stopped maybe a week later I was back bleedind in haven't stopped! Is this normal after taking deprovera??