Ananotmy scan baby weights

Alicia
Went today for ananotmy scan and was told that baby weighs around 13 ounces! Does that seem big? This is my 4th but according to different <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a> she is about 4-5 ounces heavier than they say! I will be 20 weeks tomorrow....