It's not that uncommon for Covid to cause blood clots. Your leg may be totally unrelated to coronavirus but as others have said - go see your doc. Better safe than sorry.
That's true, you should go to your doc asap and see what he says.. I would also like to recommend that you check out the service called (stop spamming) where you will surely find some helpful info and meds. Good luck with it, hope I was helpful here