What are you measuring?

I'm currently 24 weeks with b/g twins...I measured myself today for fun and noticed I was 38 1/2 inches around the biggest part of my stomach. Does this sound about right for 24 week twins? What are you other twin moms measuring? I was told you should be between 6-8 inches bigger than your weeks; if this is accurate I'm six inches bigger! Exciting because we are praying for no NICU time!