Calf pain?

Sauleeh

Hello all fitness lovers! I just had to stop my insanity day 6 video due to half pain. I experienced a bit of calf muscle pulling yesterday but it got worse today. The pain is on both of my calves(Spelling?) . It's on the outside, and when I was doing the warm up and stretches i could feel something pulling. Is it dangerous? I don't think I have ever experienced this. What could it be?