You don’t simply add nine months. Since pregnancy is technically 40 weeks (280 days) starting from the LMP , you would add 266 days to your conception date to find your due date.
so we can look at some specific milestones for your timeline? calculate due date
If you have irregular periods or can’t remember your last start date, a first-trimester ultrasound is the most accurate way to calculate a due date. You don’t simply add nine months
While only about 5% of babies actually arrive on their exact due date, calculating that date is a vital part of your prenatal care. It helps your doctor monitor milestones, schedule important tests, and ensures you’re prepared for the big day. If you have irregular periods or can’t remember
It’s helpful to think of your due date as a "due zone." A pregnancy is considered anywhere between 37 and 42 weeks . Early Term: 37 weeks to 38 weeks and 6 days. Full Term: 39 weeks to 40 weeks and 6 days. Late Term: 41 weeks to 41 weeks and 6 days. Post-term: 42 weeks and beyond.
Here is everything you need to know about how to calculate your due date, the science behind the methods, and why that date might change. 1. The Standard Method: Naegele’s Rule
If an ultrasound shows the baby is significantly larger or smaller than the LMP suggests, the doctor may shift the date to match the scan.