small babe @ 2 percentile??

Any other mamas have babies that are measuring small?? Im so worried now! I just came from an ultrasound that was ordered due to my belly measuring small at my last appt. The ultrasound tech did her measurements and baby looks to be measuring a little over 3 pounds at 35 weeks and is in the 2 percentile. I won't know what my OB wants to do until Monday. Any other tiny babies?? What did your doctors say?