In the horse screen, select the "Pregnant" tab.
If you have not entered cover date, nothing appears in the blue information bar.
Check the box to record information about pregnancy.
You can enter the date normally, or use the calendar that opens under the small arrow.
Alternatively you may choose the number of "months pregnant" so the program counts backwards from today's date.
In the third box you can change the expected gestation length based on your own experiences with the mare.
When you add new information, the information is changed simultaneously in the blue field.
The foaling report in your stable provide good information.