Big for 30 weeks....

Jasmine
Is anyone measuring larger than would be expected for their gestational age? I'm 30 weeks now, but look like I'm closer to 40 weeks. 
 t every OB appointment I've measured about 3-5 fundal height inches then expected. I'm negative for gestational diabetes or other conditions that might cause unexpected growth. I've also gained with in the recommended amount giving my age/height/pre-pregnancy weight. Does anyone have any idea what might be going on? Similar experiences?