I'm new and a FTM, 35 weeks and about 20 mins ago my whole tummy got tight and having mild cramps.…

I'm new and a FTM, 35 weeks and about 20 mins ago my whole tummy got tight and having mild cramps. Pressure and he's moving. I couldn't really get up from my side cause it was hurting. After like 15 mins I went to poo and now I still feel cramps and back ache. Braxon hicks? Are they suppose to last so long? Haven't felt this at all this pregnancy. It stays but then gets more intense then feels a little better but still there. Should I be worried it's early labor? So far it's been over 20 mins.