Ovulation tests

Larah • Almost 19, 1 miscarriage. Have severe endometriosis. TTC very much want our first bubba.
Is it possible to ovulate after your apparent scheduled ovulation date . I'm having a lot of wierd stabbing in my left ovary so I took an ovulation test and it's the darkest one I've got since I started testing in my green area . Oh and my temps went down in my green area not up .