Belly stretching already?

Diana

I'm 7w3d with my second pregnancy and feel like I'm already having belly stretching pains. The pains usually only happen at night when I'm laying in bed. Does anyone else feel these already? I go see my doctor in 6 days but thought that it's so early for this! My first pregnancy was twins. I didn't show with my first until about 15-16 weeks and I can already tell that my belly is about that size at only 7 weeks. How does everyone else feel?