28week appointment&weight question

Annelise • Mom of 5
So I had a appointment today to be tested for glucose. The drink wasn't that bad supprisenly. I had an orange flavored one. Found out I've only gained 9pounds threw out my entire pregnancy. Blood pressure was good. Got to hear my baby boys heart beat which is 135. The measured me and I measured out to 30weeks so they said he must have had a growth spurt. Has this happened to anyone else? Anyone measuring bigger go into labor earlier? I'm a ftm so I'm just not sure what expect. An will I always measure 2weeks bigger now? Or when I go back in for my 30week appt will he measure at 30weeks? I just don't know what expect. Other then that they said we are both healthy an doing great. And I was to enjoy the rest of my low risk pregnancy an that I can have any type of birth I would like to because I have no risks so far. I love getting good news (: