Could I be miscarrying

Hello ladies I had my last menstrual cycle last month and my husband and I were trying for baby number two last month. With talking with my doctor I knew my window of ovulation based on my later ovulation. Well I began having pregnancy symptoms I remember having with my daughter and decided to test. Seven tests later all say positive. I've had some cramping and bleeding which I never had with my daughter. If my math is right I would only be around three weeks. There has been no clotting in the blood. I went in for a blood test yesterday and will go back tomorrow. Has anyone else had this happen and it be implantation bleeding and carried a healthy baby to term? I read online a percentage of women have heavier implantation bleeding.