I need some advice pleasee

I’m pregnant with twins 28 weeks and 2 days and I’ve been having lower back pain pretty pretty bad pain in my back and my lower abdomen like i can’t even stand up straight and walk it’s pretty intense this is the 3rd day of it going on. I’ve been using a heating pad on my back and the pain comes and goes. It’s almost like the placements of the pain is like a belt around me is this contractions? I haven’t had a baby in 3 years and I’m probably going to go to the hospital this evening just want to know what you guys think