i would go by the measurement of the baby. you could have ovulated late than you thought, and/or maybe the baby implanted late
No I did ovulation calculators and it said from the 5th the 11th but I had intercourse again on the 13and the 9th that's why I'm a little confused based on my lmp and days in cycle my due date is march1stbased on the u-s it's march 6 and I really really wanna know
It may be difficult to calculate when you conceived unless you know when you ovulated. Did you do any Ovulation Predictors (OPK)? Did you notice any implantation bleeding?
For me I know when we conceived since we were doing infertility treatments. For me last lmp was May 25th, conceived on June 8th and due Feb 29th. I don't have regular cycles.