Pregnancy dating and viability

If this occurs, your maternity care provider might recommend coming back in a few days or a week, to check again.

Your pregnancy is dated from the first day of your last menstrual cycle.The embryo’s heart begins to beat around 6 weeks of pregnancy – sometimes earlier, sometimes later.A transvaginal ultrasound (an internal ultrasound) can detect a heartbeat around 6 weeks of pregnancy.While cell damage hasn’t been documented concretely, the potential is enough for the FDA and ACOG to recommend limited use.Some doctors recommend that unnecessary exposure to ultrasound (especially near the baby’s head) be avoided until 18 weeks.

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