Hello I am 19 years old I have VERY irregular periods I can't really remember the last time I had my period I think it was October(2012) or before. We are now in January(2013). Me and my boyfriend have unprotected sex at least once or twice a week. And yes he ejaculates in me all the time. I was on the DEPO shot twice in 2011 and after that I started taking birth control for about 4 months. My boyfriend has been ejaculating in me with no sort of back up method for about 4-6 months but no sign of pregnancy. I've took many pregnancy tests in the past but all negative. So last night I noticed some brown spotting. What could it be? Period coming? Pregnancy? Anybody ever experience this or anything similar?

It could be period coming, it could just be random spotting, it could be spotting because of pregnancy.

My concern is the last of regular periods, what have the doctors said, When on birth control pills, did that make period regular ?

not knowing a missed period will hurt trying to time the testing, but about 4 or 5 week after the last sex, do a pregnancy test, then about every two weeks, to tell.