Chronic pelvic pain associated with menstruation is characteristic for presence of endometriomas, cysts occurring as a part of endometriosis, when endometrial tissue (the mucous membrane that makes up the inner layer of the uterine wall) grows in the ovaries.
Ovarian suppression with oral contraceptives, is one way to treat this condition.
If spotting, breakthrough bleeding, or nausea occur, the use of tablets should be continued.
These side effects, most frequently occurring in the first cycle, will stop within a week.
Headache is also a commonly reported adverse event in usage of oral contraceptives, and, frequently mentioned as a reason not to begin or continue use of OCs.
The onset or worsening of migraine or the development of headache of a new pattern that is recurrent, persistent, or severe requires discontinuation of oral contraceptives.

thank you. i know that all birth control has these side effects, it's just i heard zovia had the worst. i've seen posts from many people saying that their symptoms were so bad they had to switch.