I started a new brand of birth control this past Wednesday (July 31, 2013) and have been having on and off headaches ever since. I took Advil and they go away but come back. I wasn't too concern until last night. I woke up with a sharp pain on the left side of the uterus (assuming my left ovary?) and then the pain was not only just on my left side but thought my uterus is what if felt like. The pain lasted for about 45 minutes, didn't hurt as bad when I would sit up and slowly started to feel better when I laid in one position and didn't move until it stopped hurting. I have had a few pains since I woke up this morning but they are only a few seconds long. Could this be a cause of starting a new brand and my body isn't taking it well or could it something more sever?

Thank you,
Melissa