Feeling huge at 18 weeks 5 days.

On Thursday I'll be 19 weeks. I will also be having a 3D ultrasound where we can find out the gender. We are REALLY praying for a boy this time. We have two beautiful girls and will love a third if that's the case but my heart is set on a boy. My question is has anyone had only girls and then got their boy and was significantly bigger that pregnancy? I swear I look like I'm 7 months pregnant already.