im 19 ive been on yaz for awhile now maybe 4 months and everything has been going good... i am pretty pissy sometimes and i dont get it because its supposed to reduce though symptoms and sometimes i feel like its worse than it was... well half way through my pack this month ive had huge clumps of dark blood that has lasted the last couple of weeks (seriously sucks) and it went away for a day or two but now its time to start my period... every time my boyfriend and i try to have sex huge clumps of blood come out... tell me whats up!