What are the signs of labor?

So I’m 22 weeks pregnant i have gestational diabetes, at my anatomy scan a week ago babe was measuring 1 pound 3 oz. Last night I was extremely uncomfortable and achy. This morning I woke up and it’s hard to take full breaths, my stomach is aching (Like the muscles not the organ) i cant stop going to the bathroom and now I can feel some pressure and kicking at my cervix…this isn’t a sign of early labor is it? I’m getting worried…I have an appointment in a couple hours with my GP but I need some reassurance.