Some people don't find out until the both of them are born. Things happen!
I found out at my dating ultrasound at nine weeks.
Mmm i had one and it was from a carenet and i was only 6 weeks. Idk i prob dont it just wasnt like this with my son so it weird. It doesnt take forever it just jumps around alot.
You did not have an ultrasound to confirm due date? They can tell almost right away if it's twins or not. Both my friends found out they were having twins at 9 and 11 weeks. You prob just have a very active baby. My daughter is all over the place every appointment. It takes forever to find her heart beat.