It does sound like prelabour...
You might find it starts up like every night and then just dies down again - this can go on for a few days/weeks unfortunately. One of my mums who is due at the moment has had this going on every night for nearly a week and half.
If you can, the best thing to do is ignore it. I know easier said than done! But if does go on for a week or two it can become really mentally and physically exhausting if you get all wound up every time it happens.
Hopefully not too much longer for you hun !