Wow I just posted something like this a few minutes ago. My leg has also been hurting for 3 days, mostly in the same place that yours is. The pain is in other places too but when it first started it was mostly in my back thigh. Now its starting to tingle a little. I hope we do not have a blood clot. this was my first thought. I read about this thing called a Bakers Cyst? Look that up and see if that sounds like what you have. Good luck:)
Hi
Welcome to the MedHelp forum!
Either you are over doing the pilates or have a nerve injury or a pinched nerve. It can also be a blood clot in the blood vessels, but less likely.
You may need nerve conduction tests to start with and a color dopplar to rule out clots.
Do discuss this with your doctor and get yourself examined. Take care!