Health-care providers define the stage or length of pregnancy differently than many people might think. Logically, one might imagine we represent a pregnancy by how much time has elapsed since conception.Instead, we most commonly date pregnancies from the first day of the last menstrual period (LMP).
I think ultra sounds are obviously a great piece of technology, but they are not 100% accurate and a lot of times they make mommy's worry more than they need to. Martha Mommy to Keaton 12/22/07 EDD Absolutely go with the ultrasound! before I started BCPs, my cycles were always 32-35 days. This cycle, we were moving, buying a house, and I was weaning my daughter. I would have had another 50-something-day cycle had I not conceived.
There are various ways to estimate the day of ovulation.
You can estimate your date of ovulation and conception from the length of your menstrual cycle if this is fairly regular.
The day of conception depends on: An obvious fact is you cannot conceive until you ovulate; therefore, the most likely date of conception is on the day of ovulation, if there is sperm around.
If you can determine that day, you will come close to identifying your date conception.