Then that is more the likey what they are looking for. To make you you are ovulating so that they know the best method to help you to conceive.
depends are you talking to your dr about getting pregnant?
would they do that even when am older am 39 yr old
So your Dr asked you to get a CD21 blood test. That would test your progestrone levels to see if you ovulated that month or not. They are looking for it to be over 12 most of the time, some drs say 10. The higher the levels the higher your chance of being pregnant. If it's not then they can give you medications that will help you to ovulate.