Femur 7% percentile at 36 wks

Should I be concerned? The sonographer at 36 wk scan said everything was fine but did say the legs were really curled under when trying to measure. Then the midwife said legs are growing fine but are low percentile and try not to worry as I'm small (5ft 1). I also questioned the dr and she said they dont worry about that this far along and could be a number of things. Now I am worrying tho!! The average femur length in 68 mm and mine measured 64.8... so not really a huge difference. Please someone put my mind at ease 😪