Should I see a doctor or is it normal?

I’m 20 weeks pregnant and for the past few days I’ve been experiencing strong constipation like cramps that last about 40secs then stop. I’m not constipated I’m going more than I normally do and sorry for too much information but when I do go they are quite big for me. The cramps are happening every few hour and feel like they are becoming more intense.

Just don’t want to make myself look silly if it’s normal?

Anyone experienced this?