leg cramps are driving me insane!!!! HELP!!

Hi all, so, I keep getting leg cramps in the evenings, about 7pm is when it usually starts and it's every damn night!! 😭😭 I'm not pregnant at mo (at least I don't think I am as in CD31 and AF due Friday) but I had a missed miscarriage in early October at 10w4d and have been getting the cramps ever since my pregnancy!! Anyone else have the same and could give me some possible ideas of WHY this is happening?? I've never had anything like this before (apart from the usual post-gym cramps) so it's making me feel quite rotten!! 😭😭 Please HELP!!!! xx