I am 26 year old female, and for the last 3 months on and off have been having this severe pain in my left calf. It will be there one day when I wake up and hurt for 2-3 days then will go away for awhile. I have been to my primary doctor and he has ran some blood tests, but tells me that it is not a blood clot. How do you know when you may have a blood clot? I take birth control and have high cholesterol=total 250(ldl-123,hdl-110) I just want to make sure that they are not overlooking something