A podcast about pregnancy and drug use, Native people and tribal sovereignty. Medical professionals use a standard set of up to three methods to date pregnancies: last menstrual period, ultrasound, and a physical exam. That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age. However, the timing of the actual delivery is not so predictable. Some women will deliver on their due date, others before, and others after. The body is not on a clock counting down to delivery; natural variation will introduce uncertainty.
How Doctors Date Pregnancies, Explained
Due Date Calculator
You can change your city from here. We serve personalized stories based on the selected city. By tracking your ovulation cycle, you can know when is the best time for you to have sex with your partner if you want to have a baby. Ideally, if you have sex within your ovulation period, the chances of pregnancy are fairly high. Whether you are trying to conceive or whether you want to put it on buffer for now, an ovulation calculator can help you do both. When you have sex during the non-ovulating and low risk days of the month, the chances of pregnancy are fairly low. FAQs How to use an ovulation calculator?
Pregnancy Calculator: Babies Due Date Calculator
Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation [26,27]. The due date may be estimated by adding days 9 months and 7 days to the first day of the last menstrual period LMP.
Back to Your pregnancy and baby guide. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period. Sign up for Start4Life's pregnancy and baby emails for expert advice, videos and tips on pregnancy, birth and beyond. You can find pregnancy and baby apps and tools in the NHS apps library.