I just had twins. My stomach got big rapidly! I had a singleton pregnancy before this one and it was completely different. I knew I was either having a boy or having twins. I was 9 weeks when I went for my first soon and the results of it was twins.
I'm 5 Weeks Pregnant MY STOMACH IS BIG?
Ultrasound at doctors office. Don't know at what week you can visually see two hearts/bodies, but the ultrasound will tell you. Ask your doctor next time you visit.