30w measuring 34-any advice?

So last appointment (2 weeks ago) I was 28 weeks and my tummy measured 32 1/2....went back today at 30 weeks and I'm measuring 34 weeks so we have an ultrasound next visit (2 weeks) to see how she's really measuring. Anyone been through this? Should I be worried about going into labor sooner? Or just having a big girl? My husband is 6'5" and I'm 5'4" so maybes she's gonna have long legs like daddy ;) thanks in advance!