Abnormal uterine bleeding (2nd time happening)

Hey ladies! I'll try to make this a long story short. Last year, I had unprotected sex, missed my period, thought i was pregnant, then 6 tests later, still negative. I bled for months at a time and finally went to the OB-GYN. I had lost so much blood that i almost needed a transfusion and i was also diagnosed with Iron Deficiency Anemia. I was put on birth control, my cycles regulated. Boom, I started having sexual activity. Missed my period for about 4 months, and now the uterine bleeding has started again. This time, i have cramps along with huge blood clots. (i didn't have cramps the first time) i passed a clot this time that looked VERY strange....it's mixed with white fluid this time. What in the world could it be?! **SEE PIC ATTACHED

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