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In cases where the date of conception is known precisely, such as with in vitro fertilization, the EDD is calculated by adding 266 days to the date of conception. American College of Obstetricians and Gynecologists.

Ultrasound uses the size of the fetus to determine the gestational age (the time elapsed since the the first day of the last menstrual period).

Why enjoy a normal ol' blind date when you could go on a blind date chaperoned by your ex?

That was the concept behind —effectively increasing the awkwardness of the blind date tenfold.

Each man would get 60 seconds to make his case, and the girls had the chance to, essentially, swipe right or left.

If two women chose the same guy, he got to pick between them—turning the tables and giving us the drama we craved oh, so much.

The H-Swipe app connects to an innovative digital windscreen and interactive directional windscreen “s-wipers”, and uses geolocation technology to pinpoint the nearest potential dating candidate.Prioritizing personality over looks, covered the faces of the 20 bachelors one lucky woman was to choose from.The masks helped ensure that the bachelorette would make her decision based on internal beauty instead of relying on external attraction, but viewers never got to see who she picked because the show was cancelled after five episodes. Who knew she ventured into the world of romantic reality TV?The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age. "Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age" [24].