Ay alam ko yan worry, first time mom ka pa lang kaya mas nag-aalala! Honestly, a few of us had similar situations with our babies and most turned out fine, sometimes babies lang talaga ang size nila, or the dating was off pa lang, pero the best thing talaga is to follow up with your OB para ma-monitor nang mabuti and they can do repeat ultrasound to check if ang growth is on track. Wag masyado mag-stress kasi stress din ang ibibigay mo sa baby, just make sure ka-complete ka sa check-ups at vitamins mo! Hugs, mommy, aabutin ninyo ito!