In the News
When you're pregnant, the due date is the estimated day your baby will arrive. There are many ways to calculate your due date, including using an ultrasound. Typically, a due date calculated using a first-trimester ultrasound is only off by five to seven days, said Anushka Chelliah, M.D., a maternal-fetal medicine specialist at Obstetrix® Maternal-Fetal Medicine Specialists of Houston, part of Pediatrix® Medical Group. If it differs from your last menstrual period (LMP)-due date by more than seven days, the ultrasound due date gets priority, said Dr. Chelliah. A common question is how you are four weeks pregnant if you conceived two weeks ago. Your pregnancy is dated from the first day of your LMP and not from the day of conception, which usually happens around day 14 of your cycle, explained Dr. Chelliah. “When calculating pregnancy, we start counting from day one of your last period, even though you are not pregnant during those first two weeks,” she said.
View the full story on WebMD