Pain?

I’m almost 31 weeks and today I’ve woken up with a really uncomfortable pain right at the bottom of my stomach. It’s like a dull aching mild period pain but it’s really bothering me. At first I thought I just needed the toilet but after that the pain is still here and I’ve had it for about one and a half hours now. It slightly goes when I change positions but keeps coming back and it’s really annoying. Is this Braxton hicks or could it be something else?