Well I just recently switched to Kariva birth control. I am now on the 11th pill. I was on cryselle for 3 months until my doctor switched me to Kariva because of constant nausea. I had unprotected sex(pull-out method) on the 1st day of placebo pills in last pack of Cryselle. I took all the placebo pills. Skipped a day and then started Kariva. I am still nauseous. Cramping in my lower abdominal area and it moves to my back. I also have constant headaches. Could I be pregnant or is it from switching the pills ?