We are trying to conceive. I was 15 days late for my period. Have all traditional pregnancy symptoms. Took 9 HPT, all were negativ, except a very faint line on one. On day ( which I heard was when the embryo usually attaches to the uterine wall) I started very spotty bright bleeding with cramps. The next day I went to the doctor. He sent me to the hospital to have all types of testing: Thyroid, quantum HCG, Progesterone, and a few others. also he said the bleeding would probably continue. He gave me prenatal samples. it has been 4 days since the bright bleeding and heavy crammping began there was a little stringy dark stuff but very light blood. Could I be pregnant with implantation bleeding? I have had reagular periods for 10 months