Charley horses anyone?

Dr
39 weeks and Lately I've been getting these awful Charley horses in my upper thigh and buttock. Mostly on the left side. They used to be small and while painful manageable. I could keep on walking as if nothing was wrong with me even tho I was yelping on the inside. But now they are much more intense, I can't grin and bear it and I've even had one take me down. 
Anyone else going through this? Do you know what's causing it? It usually happens in a series at a certain part of the day. But is fine for the rest of the time. Can't wait to have my little dude out!

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