Accurate ultrasound dating conception
This article was co-authored by Carrie Noriega, MD. Noriega is a Board Certified Obstetrician & Gynecologist in Colorado.She completed her residency at the University of Missouri - Kansas City in 2005.Unfortunately, it’s very difficult to determine the exact day you got pregnant.
During the luteal phase, a fertilized egg would implant in the uterus and hormones would work to help the start of a pregnancy.
So, if you’re trying to figure out when you conceived and how far along you are, think back to your last period, and add 14 days from the first day of menstruation.
You can use this date to estimate when you may have conceived, and count from there how far along you may be.
For women who track their cycles through an app, or through basal body temperature tracking, you can use prior cycle information to determine when you may have ovulated.
While ovulation varies from month to month, and it is nearly impossible to determine the exact date of ovulation, most women with a 28-day cycle can expect ovulation to occur around day 14 (essentially two weeks following the first day of their period).
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That’s because sperm can survive inside the vagina for up to five days after sex, waiting for an egg to become available during ovulation.