What is the definitive guide to using Hilary Erickson's pregnancy calculator?

Using my pregnancy calculator is quite straightforward. Here's a step-by-step guide:

1. First, you need to know the first day of your last menstrual period. This is crucial as it forms the basis for calculating your due date and other important milestones.

2. Once you have this date, you can enter it into the calculator. You'll see fields for the year, month, and day. Fill these in accordingly.

3. After entering the date, click on the button to calculate. The calculator will then provide you with a range of information.

4. You'll get an estimated due date, the probable date of conception, the fetal age today, and the best dates for various scans and tests.

5. Remember, this is just an estimate. The actual dates may vary depending on when conception occurred and other factors.

6. You can use this information to plan for your pregnancy and keep track of important milestones.

Remember, I'm here to help you navigate your pregnancy journey. If you have any more questions or need further clarification, feel free to ask!