Hello Thanks for the query. The possibility here is that you had a pregnancy which you miscarried. The passage of blood clots and low hormone levels point to that. The loss of breast tenderness could also be due to that, but it is not reliable. Further by 6 weeks of pregnancy, a gestational sac and fetal pole should be seen on transvaginal ultrasound, which did not happen. Hence, the possibility of a failed ( aborted ) pregnancy is high. If the blood levels further decrease, they might come to normal on their own, in which case it is a spontaneous abortion, and you require no treatment further. Please have regular follow up as advised. Causes of such abortions are many - from idiopathic ( no cause ) to genetic cause in the baby, to an incompetent uterine cervix, trauma, infection, hormonal imbalance, immune causes etc. Take care.