Charley horse-consistent pain

I’m 25 weeks and 5 days today and yesterday morning right when I woke up I had the worst charley horse ever! I was screaming and in so much pain, my fiance rubbed my calf until the pain stopped but since it happened my calf has been hurting and feels like a constant cramp. It doesn’t hurt when my leg is relaxed but if I’m walking or stretching my leg anyway it hurts. I’ve never had a charley horse before so not sure if that’s normal or if it’s from something else. Any ideas? Thanks.