3rd pregnancy.. Bump way bigger

Kretia
So I am 13 weeks along with 3rd baby an my bump is as big as I was at 24 weeks with both of my other pregnancies. I'm getting really nervous an anxious for an ultrasound but won't get one until next week. Multiples run in my famil but not in husbands. Anyone else going through this? Or having twins an looked like this?