Ovarian issues??

Alicia
For the last week and a half I have been spotting off and on and it has been a brown tint. This started at ovulation time for me. I have also been very nauseous today. I have also been having periodic cramping similar to menstrual period cramps. I am supposed to start my period in 2 days. Any ideas on what the issue could be? I am just asking for advise.