Bathroom issues

Question for you ladies, I am constipated (nothing new for my third trimester 🙄) but a couple tomes a day I get these period/diarrhea feeling cramps (tmi but the ones you get when you know your tummy is not feeling well and you need a toilet asap) they last for maybe a minute or two, I try to go to the bathroom but nothing, no gas, no poop, nothing! Is this normal?