Advice

I’m only 5 weeks going on 6 weeks pregnant. This is my fourth pregnancy, third ended in a miscarriage. Besides that, I’ve never had trouble sleeping this early on. I wouldn’t really even say its hard to sleep, I can fall asleep fine... However, I’ve noticed a lot of extra pressure and even some slight pain/ tenderness after awhile of sleeping on my stomach. Which I’ve never experienced this early with any of my previous carries. Is this normal? Could it be twins making it more tender? As soon as I love to my side I’m perfectly fine. Anyone have this same problem???