Serve abdomen and back cramps and abdominal soreness & intermittent stabbing pain near ribs. What can cause this? Also took aygestin (norethindrone) 10 before cycle.

Need to be seen. Many things on the list of what could cause your symptoms (intestine/stomach issues, gyn issues, muscle issues, infection..the list is long). You need to be seen by a doctor and evaluated ASAP. Best of luck with this. Dr R.