Loads of pressure should I go to the ER?

I'm currently 20+3 weeks pregnant and I feel a lot of pressure in my tummy and back. Not necessarily pain but just pressure and I can't even suck in my tummy anymore. Is this normal? Also it burn a little when I pee if that helps I'm just confused. First pregnancy here lol I just don't want to miss a sign if it's preterm birth or something 😕😥 EDIT; the pressure is all over and it comes and goes