EFW on growth scan at 33 weeks?

I have recently had a growth scan due to my previous daughter being a small weight at term (5lb 13oz) and although the sonographer was unable to measure the HC due to fetal lie she gave a estimated fetal weight of 186.7g, now this equates to not even being a 1lb in weight at this stage..we asked if everything seemed normal at the scan and she said yes, could this be a typing error on her part and more likely to be 1867g which would put her in the 15th percentile and thus being small but quite normal? I'm worried now. I dont have another consultation until next week but this will do my head in till then.