How to tell if water slowly leaking or keep peeing

I'm 31 weeks 1 day and for about 3 days I can't stop peeing all the time it's a lot of pee to. I have noticed my pants being wet but I thought was pee. It keeps happening I am now wearing pads. It's not loads and it has a yellowish colour to it but no smell. How am I ment to know if I keep peeing myself or not. I did pee myself alot in the beginning when being sick with morning sickness so I do have a weak bladder.