Baby size and Menstrual cycle

Yesterday I met my doctor for the first time and glad to see my baby is growing up in uterus. It is supposed to be week 6, however doctor said embryo is a week smaller. So he counted as week 5. May I ask do anyone know is the menstrual cycle affect? My menstrual cycle is 32 days

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My cycle is rather long and irregular. I was 8 weeks after last menstruation at my first gynae appointment. The foetus turned out to be about 5w3d only. I'd say it's more accurate to estimate from the ultrasound than from date of your last period