Charlie Horse!

I woke up at 4AM with TERRIBLE pain in my right calf muscle. It subsided eventually and I went back to bed. When I woke this morning, it's still very sore. Has anyone else experienced this?? I drink water all day, take a magenism supplement, prenatals, and get plenty of calcium and potassium. I really just want to be sure it sounds like normal Charlie horse pregnancy issues and nothing scary like a blood clot. Thank you!!