Ori ToolsHow to use
- Enter the first day of your last period.
- Set the reference date (today by default).
- Enter your cycle length and press Calculate.
When to use it
- Tracking weekly milestones
- Preparing for appointments
- Answering "how far along are you?"
How weeks are counted
Pregnancy is counted from the first day of the last period, about two weeks before conception. "8 weeks 3 days" means 59 days since that date. Clinics may adjust the count after an ultrasound.
Frequently asked questions
Why count from the last period?
It is a date most people know, so it became the standard.
What is the first trimester?
Up to the end of week 13.
Can I pick another date?
Yes, change the reference date.