Baby measuring in 13th percentile

Theresa
I had my anatomy scan last Friday and got the results today. The doctor said that everything was looking good (heart, organs, placenta);however, the baby was measuring in the 13th percentile overall and about 5 days behind. I have been measuring a few days ahead the entire pregnancy until this. My doctor is having me go back for another scan at 28 weeks, but that's 8 weeks away. 
I was 19 weeks 2 days at the scan, but baby was measuring around 18 weeks 0 days and 18 weeks 4 days for different measurements.
The doctor said everything should be okay, but being this is my first pregnancy, I'm a little worried 
This was her last Friday. 

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