Best to speak to your care provider. Like you mention they do not sound like BH as there is cramping feelings. it could be as simple as just need to take a calcium magnesium supplement (I had to with DD3s pg from 23 weeks on).

Also, if you are stressed that can influence things as you get tired and your body reacts.

Hopefully it passes soon. it is common, but I would err on side of caution regarding any cramping and ask your CP xx