Measuring bigger!

Kayla
Im currently 35 weeks and 3 days and  all the way up till 33 weeks i measured on time with ultrasounds and belly measurements. Well at my check up at 33 weeks and 2 days my belly measured 34 weeks and my last vist at 35 weeks and 2 days my belly measurer 36 weeks. Why would my belly all the  sudden start being bigger.?