Is my pain in the right ovary related to ovarian cancer?

Hi doctor,

Two days before I got my period, I started having sudden, sharp stabbing pain in my right ovary. These pains would slowly subside, although I could always feel a small sensation in the same spot, until it flared up again. It seemed to be agitated by the movement. I stay perfectly still most of the time, and so there is no stabbing feeling. I asked my mother, who is a nurse, to check it out. She validated that the pain was ovarian and cleared me of having appendicitis. Over two days, the pain has continued at random times, but not worsened. Now I am on my period. The blood is thick, sticky and totally brown to pretty bright red with heavy bleeding.

I am normally a heavy bleeder during the first few days, but the color and consistency are unusual. I am also having my usual period symptoms, such as achiness and bloating. Hence, it is hard to pinpoint whether it is just my period or the ovarian pain. I have had a normal period before this one and no sexual exposure during or in between, so I know I am not pregnant. I am also at a very low risk for STDs. I am worried, as the women on my mother's side have a history of ovarian cancer and cysts. I know I am quite young for such a thing to happen to me. As I do not have any other symptoms related to other causes, such as PID, I do not know what else it could be. I just started on birth control pills again last night. Otherwise, I do not take any oral medication except topical treatment for itchy scalp, acne and eczema. Am I crazy in worrying? What could this be?

Please help