From tracking your period and ovulation, to your due date, to your baby’s growth
Calculators for women from tracking your period and ovulation, to your due date and how many weeks and months pregnant you are, to following your baby’s growth after birth.
We use Naegele’s rule for the due date (280 days from the first day of the last period), the Institute of Medicine (IOM 2009) guidelines for pregnancy weight gain and the WHO child growth standards.
It is an estimate using Naegele’s rule. Only a small share of babies arrive on the exact day; most are born in the weeks around it. If you had an early ultrasound, the calculator can use it, which is more accurate.
No. Ovulation shifts from month to month and the calculator only gives estimated days, so it is not a method of contraception. Ask your doctor about a suitable method.
If pregnancy is possible, take a pregnancy test. If you have had no period for 90 days or more, or your cycle has become very irregular, see a gynaecologist.