Belly size

Helen
It is fun to see all bellies grow, but also strange that first time moms with singletons having a bigger baby belly than me. I am a second time mom- with twins 🙈 I measure about 21 weeks, I am 15 weeks today. In addition to that, I have a split in my abdominal muscles from last pregnancy- also contributing to my small bump! 
I am guessing that many push it out a little extra? 🙊