PAPP-A level low- Help!!!

Alexis
So I just got the results of my sequential screening back and they said I my results came back negative (which is awesome) and all my tests came back really good except for one. My PAPP-A level (protein in the placenta). My level was at a .47 and the normal range starts at .50. My doctor wasn't too concerned but did say I will have an extra growth ultrasound at 32 weeks to make sure baby is growing normally, but didn't give me much more info. I didn't really ask, guess I was just shocked. So I came home and googled it!! BIG MISTAKE! Now I'm freaking out! Did anyone else have this happen and everything he ok?