29 weeks... is this Braxton hicks or something more?

I'm 29 weeks with baby #2... I have been having Braxton hicks (i think??) for the last 3 or 4 hours... my belly gets really hard and it hurts especially at the top... then will let go, then repeat. No pattern it doesnt seem. But often. And I feel this pressure like I need to poop but cant. I keep going to the bathroom every 15 minutes or so and just sit there holding my belly and it hurts so ill lay down on the floor. I'm fixing to take a bath and try to relax but ugh. Is this normal???