As complex as it is, it's a wonder the human body works as well as it does.

But when there is a change like you are experiencing, it's often necessary to seek a doctor's examination to find out why.

It's impossible to say what has happened to change your routine without that exam. You may have an ovarian cyst, or medications you are taking, exercise, stress from work or school, diet, weight gain or loss, polyps, pelvic inflammation, can cause these changes, and in older women, they may be approaching perimenopause, or menopause. There may be other reasons.

You should schedule a visit with a gynecologist and discuss this change and see if they can find the cause and help relieve the cramping.