Mensing symptoms and conditions

I have read most of the postings on Yasmin but I haven't seen one where women pointed out experiencing terrible amounts of clots and incredible amounts of actual mensing... So it makes me wonder if I have another underlying condition? I have been taking Yasmin for about18 days now, started on my first day of mensing, and 18 days later, still mensing like there is no tomorrow and passing clots the size of the palm of my hands at times!!! It's unreal! And I went and bought 3 packages, I wanted to finish one and see but I think it's all gonna go to garbage now!! And to say I use to have a 30 day cycle with 2 days of pre-spotting followed by 3 days of actual mensing... some clots but not half as big and certainly not as many!!! Very disappointed with Yasmin. I am done with it.