What is ovulation and how do I know when I am ovulating?

Release of an egg. There are several ways to tell if you are ovulating: over-the-counter ovulation detection kits (odk), ultrasound at mid cycle, Progesterone level approximately 7 days before you anticipate your period and/or an endometrial biopsy. Your gyn should be able to perform any of these and you can do the odk yourself.