ultrasound said it's june 3rd, 2013 or supposely meassured at that due date but my doctor said by lmp will be may 27th, 2013. estimated due date (edd or edc) is the date that. just went to the doctors and got my first ultrasound, the ultrasound tech had told me that my due date was 09/17/13 ( a day before my birthday) but according to my lmp which was 12/05/12, my due date would be 09/10/13. if the ultrasound estimate differs by more than one week from the lmp, we would use the ultrasound estimate for the due date..Society of obstetricians and gynaecologists of canada recommends the earliest. due date is set in the first trimester, it shouldn't be changed.
it is possible that you ovulated early or in this case later than you thought. can calculate your due date by subtracting three months from the first day of your last menstrual period (lmp) and then add a week. we do use a trimester system if we are seeking to describe how far along a woman is in general terms. average time between menstrual periods is about 28 days, and ovulation occurs about 14 days before the next period begins. with my son the ultrasound was accurate based on the fact that its estimated ovulation date was right around the time i had intercourse (was i active for months). also, when providers all use the same lmp date, we are using one system that provides a standard convention.
logically, one might imagine we represent a pregnancy by how much time has elapsed since conception. a twin pregnancy is the result of in vitro fertilization determination of. during a pelvic exam, the uterus can be felt coming over the pubic bone at about 12 weeks’ lmp and at the umbilicus (navel) at about 20 weeks. dating and an ultrasound done to look at the baby's anatomy (usually at. in the first trimester (up to and including 13 6/7 weeks of gestation) is. internet site provides information of a general nature and is designed for educational purposes only.