Due Date:
Gestational Age:

Woman's hands with a pregnancy test in her hands

NOTE: This calculator is not a diagnosis. The calculations are estimates based on averages.

Gestational age estimates how far along you are in your pregnancy. Health care providers use the gestational age in weeks (rather than months) to plan your care during pregnancy. Most pregnancies last about 40 weeks from the first day of the last menstrual period.


A missed menstrual cycle is one of the earliest symptoms of pregnancy. That’s why it is best to wait until after you’ve missed your period before taking a pregnancy test.

If you know the day of your last period this calculator can be used as a possible conception date calculator, an estimated due date (EDD calculation), or a pregnancy due date calculator.


First – Take a pause. It is important to not get ahead of yourself and worry about being pregnant before you are sure. A missed period and using this pregnancy calculator may be possible pregnancy indicators, but it doesn’t necessarily mean you are truly pregnant.

Next – A pregnancy test with an ultrasound is the best way to confirm a pregnancy and provide clear options. The pregnancy testing and ultrasound process is quick and efficient in a supportive, private environment. CAPS will provide you with a lab-certified Free pregnancy test verified by a nurse. Your nurse may also provide a Free ultrasound to determine how far along you are and any issues that may possibly exist. You will have the results during your appointment.

Pregnancy Test accuracy

Our tests are laboratory rated. They can detect the hCG pregnancy hormone as early as 7 days after conception or 21 to 24 days after the first day of your last period. The test is over 99% accurate.

Pregnancy Re-testing and if your period doesn’t start

If you tested negative for a pregnancy, you may be rescheduled for another test. The hCG hormone doubles every 2.2 days during the first three months of pregnancy.

If you have concerns about missed periods and your pregnancy test continues to be negative, you should see your health care provider for assessment.
If you need resources, CAPS can provide you OB/GYN referrals.


To get help, contact us at any of the San Diego area clinic locations, call us at 619-337-8080, or schedule an appointment.

No matter what choice you make, CAPS will be there for you before, during, and after your pregnancy.

We will help you examine the full range of options (abortion, parenting, adoption) including the variables for each option, so you can make the best choice for your situation.

All pregnancy services are FREE, including FREE pregnancy test, FREE ultrasound, and FREE pregnancy and abortion education.

  • FREE pregnancy testing – a lab grade, nurse verified test to confirm if you are actually pregnant.
  • FREE pregnancy ultrasound – to determine how far along you are, location of the pregnancy in the uterus, whether there is a presence or absence of a fetal heartbeat, and assess what options you may have.
  • FREE abortion education – to answer your questions and provide information so you can make an informed choice.
  • FREE pregnancy ‘Decision Aid’ options worksheet – to help you think through your own preferences and help you define the information you need to make a decision.

Other Services – We also provide low to no cost STI / STD testing.

All our services to you are private – your privacy is important to us.