I am on the Kariva birth control. I've been on KAriva for about 2 months. Before I was switched to Kariva, I was on crsyelle. I did have unprotected sex on the last week of my cryselle pack. I have been feeling nauseous, abdominal pain that move from the left, to the center and the right of my stomach. I also have back pain and headaches. I also have noticed a jelly like substance in my feces. Is my birth control causing these symptoms or could I be pregnant? Oh yeah, my "periods" have been normal like usual while on Kariva as well.