Bleeding everyday

I have been spotting everyday for the last two weeks. Im currently 10wks old. I went to the doctor and he said everything looks fine. The baby heartbeat was strong and he was confident that everything was ok. The downside was he could not tell me what was causing the bleeding. He took an ultrasound and everything appeared normal.  He put me on progesterone  in which I take every night before bed but the bleeding has yet to stop. Has anyone had this problem??? If so, what was the outcome.