24weeks and having butt contractions..Advice?

Lena • Mom of four 😳 pregnant with baby girl ☺️

Hey so after sex with my husband, we went to sleep and I felt like I had to poo, and tons of pressure, and tight tummy, but sat there and nothing. Went back to bed.. then happened again. While I'm on toilet, it was hurting to push and it was certain nothing was coming. I drank a bunch of water, laid on left side and still felt more "buttractions" .. I all now in a bath and hoping to get out and they will be gone. But I still feel them in the tub.

This is my 5th pregnancy and I know what Braxton Hicks are and this isn't it. I sure hope this isn't preterm...

Any advice, besides what I've been doing?