I've been on kariva for 3months. Before kariva, I was on cryselle but switched to kariva for nausea. the week before switching to kariva, I had sex on November 10th. In the 1st Month, I experienced extreme nausea, abdominal cramps and back pain. I had all my 3 periods while on kariva. They were normal and actually heavy. I took a pregnancy test on December 24th&25th and they both can back negative. The symptoms ceased shortly after the pregnancy test but now, in late January the cramping and back pain and nausea is back. Could I have tested to early to know or Do I need to change pills ?