Hey there gals

I'm 31 weeks and I have a question. I have ALOT of pressure in my bum so I'm figuring baby is engaging further (was in hospital last week and they said baby was beginning that process) and since last night - I've been peeing constantly, and some times I feel the need to pee (not urgent) and I go and it takes AGES to actually get it out... no burning or anything like that to indicate a UTI, but I'm a little confused.. I'm also getting pink tinged cm some times.

Anyone got any advice? Is the hassle going to the loo from the baby's head pushing down, or should I call the GP about a possible UTI?

thanks