Am I going to have a big baby?

Celeste

Going by my lmp and conception date im 12w5d. (With exact measurements at my 10 wk ultrasound) I had an ultrasound on Thursday and my midwife told me that baby is measuring 4 days bigger. My question is, will the baby continue to grow ahead of my dates or did it just have a little growth spurt? My other 2 sons measured exactly where they should have at every ultrasound.