you do it before your period.. while ovulating.
Typically a dog's period cycle will last for 21 days.
You should be able to reliably test 1 to 5 days after your missed period.
The time that cramps start vary with everyone. Some get them days before their period while others get them the day of their period.
your menstrual cycle (or period) can last anywhere between three and seven days..
14 days before your period starts.
A normal period can be 3-7 days long.