Completely normal unfortunately. Try and drink lots of water and bananas help. It's awful pain and can take ages to go. One of the joys of pregnancy :)
A trick that always works for me is, as soon as I feel my calf start to cramp I stand up. It goes away instantly and isn't sore at all. I make sure to walk around for a minute or so after so it doesn't come back.
And yes, water and bananas help a lot too to prevent them.
I used to get them when I would wake up in the middle of the night and point my feet/toes to stretch. Now I make sure when I stretch I only flex my foot back. If I feel one coming on I flex my foot really quickly, I haven't had one since. There's something about the shortening in the muscle when you put your foot down that triggers it.
I had one the other night, it was fine in the morning but then I was on my feet walking around for about 8 hours that day. When I woke up the next morning the muscle was sore and knotted and hurt for 2, almost 3 more days.
Drink a lot of water and eat some bananas.
I woke up in the middle of the night a couple of weeks back from a horrible leg cramp. It took like 3 days for calf to feel normal again.
Try staying very hydrated it may help, I have had restless leg syndrome since around 26 weeks and it has been a challenge to deal with. Also an epson salt bath may help. Hope things get better