i am 36 weeks today by midwife dates - based on 28 day cycle. my cycle is 22 days so i think that mkes me 37 weeks tommorow. why dont they allow for people with diff cycles?? evenon 20 wwek scan i was 20 6 days putting me closer to my dates. which would you go by, reason i ask is ds1 was born at 36 weeks and ds2 was born at 37 weeks.