Woke up to intense menstrual like cramp

What could this be??

I woke up 3am to intense pain across my abdomen and radiating down my right leg lasted for a few minutes and was super painful. Like a really bad menstrual cramp.

Usually my BH go away if I try and walk around or go pee, but this was not going away. And as baby moved it got more painful. It eventually subsided but as I slept I could feel more uncomfortable cramping not too crazy but uncomfortable.

Was this a contraction or a BH or something else ?? Could this be the start of labour?

Since I’ve woken up I’ve just felt weak. I’ve been nauseous on and off for about 4 days also.

37 + 2 today.