leg cramps

🦔
I'm 24 weeks and ever since a week or two ago, sometimes when I'm in my bed and stretch my legs I get a really painful leg cramp in my calve that lasts about 30 seconds. 
This happened to me again this morning but this time it's like I strained my whole calve muscle because it hurts to walk on it
Has this happened to anyone? Just wondering if this is normal/common or not in the second trimester