I'm 33 weeks, and for the last week I've woken up 3 times in the early morning (6ish am) with period pains, which are quite intense but not drastically painful. I do feel a bit of nausea whilst having them. And I have to move about and focus on breathing to be relatively comfortable.
It seems to last a few hours and then tapers off.
I also get painless Braxton Hicks when I'm active, but I don't really get them when the period type pain is happening.
I'm going to mention it to my midwife next week, but I'm assuming since they don't amount to anything, that it's nothing to worry about?
Baby is active, and was active this morning when the cramps were happening. He is not in head down position yet, he is lying transverse.
Everything I read on Google points to preterm labour 
but as it goes away after a few hours, I can't see how it could be.
Does preterm labour last for weeks? Is my body just preparing and it's just another type of Braxton Hicks?