From my LMP and how long my cycle lasts I worked out that I'm 6w2d today and due 5/01/2021 all due date calculators back that up too yet when speaking to my midwife to make a booking appointment she says I'm 6w6d today and due new years day. How can all the due date calculators even an NHS one say the same yet she puts me 4 days ahead 🤔🤷