Blood Clot? Pain.

If you’ve ever had a blood clot in your leg can you please help. I have pain in my leg, near my knee. It’s on the front side of my leg, on the side by my knee. I don’t have any pain in my calves or any where else. It’s only my left leg. It feels like a bruise, but I don’t see any bruises. I have been laying down quite a lot lately and I’m worried that the lack of movement has caused a blood clot. There’s no redness or warmth in that area of pain. What were your symptoms?