Cramps

If they go away when you get up and move around then they are likely just Braxton hicks but if they don't then you might want to go get checked out

I get them too

Yes, what @Kristen said. If they are mild and seem to go away fairly quickly especially when you change positions, there's no reason to worry. It's Braxton Hicks.

I've been getting very mild cramps here and there too

I also experienced this around 30 weeks - it felt like light period cramps, but I found them to be pretty uncomfy because I haven’t had them for almost 9 months 😅 I assumed they were Braxton hicks