To find out how many weeks pregnant you are you will need to know the date of the day you started your last menstrual period (the first day)
Note: If you don’t keep track of your periods you can try to remember what you were doing when you last got it. Where were you? Who were you with? This can help you to identify the date when your last period occured.
If you cannot remember the date of your last period or if your periods are irregular, we recommend that you get an ultrasound (sonogram) or a blood test. Knowing how many weeks pregnant you are is essential to confirm that you are a candidate to use abortion pills with safe2choose.
If you have any questions about the pregnancy calculator or how to calculate how many weeks pregnant you are, please get in touch with us via live chat.
If your last period started on or after:
27 May, 2017
You can still consider the abortion pill.
View what you need to know +
You need to know:
- The first day of your last normal menstrual period. It doesn’t matter when your last menstrual period ended, it’s the day it first started that’s important.
- If you don’t keep track of your periods, maybe you remember that your period started when you were at a family party or at any other event.
- If you don’t have any clues about the date of your last normal menstrual period, then have an ultrasound to know how pregnant you are (if available).
So, what is a normal period?
Let’s take the example of Mary. She usually has a menstrual period that lasts 7 days. It may be light the first day and then is heavy for 3 days, then light for the last 3 days.
Let’s use another example. Diana has lighter menstrual periods. Her menstrual period may last for only 3 days. She has bleeding that is heavier the first day and then very light bleeding for the next 2 days.
For Mary and Diana, that is a normal menstrual period. If the last period of Mary was only 2 days of light bleeding, that was not a normal menstrual period for her. Mary may have already been pregnant and had some spotting during pregnancy.