Pregnancy dating and viability
you’re still breastfeeding and haven’t had a regular cycle, or you were on birth control) a provider might want an early ultrasound in order to date your pregnancy.If you’ve experienced any vaginal bleeding or spotting, or have significant pain, an ultrasound might be performed to check on the viability and location of your pregnancy (e.g. Like many procedures and medications during pregnancy, large scale double-blind studies to prove the safety or risk of ultrasound are nearly impossible.So your baby may be on the 30th percentile or the 80th percentile, but still be normal.Unfortunately, if you’re around 8 weeks of pregnancy, and your dating is accurate, a lack of heartbeat usually indicates a miscarriage.However, it isn’t uncommon to be unable to detect a heartbeat via ultrasound until closer to 7 or 8 weeks.Find out more about week 6 of pregnancy in our informative pregnancy week by week series. A mother’s size, the position of her uterus, the location of baby, and the accuracy of dating can all affect when a heartbeat is seen on an ultrasound.
Where there is tissue heating, there’s an assumption that the heat might have an impact on cell development.
However, the exact day of ovulation can vary from woman to woman and cycle to cycle.
This means that this type of pregnancy dating is only an estimation.
For this reason, the FDA and ACOG recommend that only healthcare providers utilise ultrasound technology, and only as medically necessary.
Ultrasounds use sound waves to produce a picture on a screen.For many women, this means you’re 4 weeks at about the time of your missed period, and 6 weeks pregnant about two weeks after your missed period.