established by 20 weeks gestation because dating becomes increasingly inaccurate after this time. Naegele's rule. (c. day of the last normal menstrual period and counting back 3 months, the EDC is reached . (7) Taipale P, Hiilesmaa V. Predicting delivery date by ultrasound and last menstral period in early gestation.
25 Jan 2016 “If you're dating someone who has been dropping hints about Valentine's Dating Rules extravagant gifts, or dates on V-day and I'll show you a high maintenance chick. This comment was last modified 3 months ago .