B.X.
I had a DVT in my thigh, but my experience was totally different. I didn't have bouts with pain (where the pain would come and go), but had swelling in the leg and soreness. At the time, I was pregnant, so both legs were swelling, and though I mentioned it to my doc, she didn't think too much about it. After several weeks, when she finally decided to send me to the hospital to check it out, it had one spot where it hurt if I pushed on it, though the ache of the entire thigh was still there. This was a DVT though and you can also get clots in superficial veins.
What you should probably remember is that everyone experiences symptoms differently, so the symptoms one person exhibits may be different from yours. You mentioned that your mother has had clots before, so it could be that you're genetically prone to clots for one reason or another. I think I'd call your regular doctor and talk to the nurse about the situation. She can ask the doctor about it and they can advise you as to what to do. Don't take any chances with something this serious!