Two periods back to back with a week inbetween. now cramping two weeks after last one ended but no blood, just a tiny bit of spotting. causes?

Can't tell: It would be impossible to tell why your periods and bleeding are this way. You would need to see your ob/gyn to have an exam and probably an ultrasound and likely some blood tests to reach a diagnosis.

Not uncommon: Weight gian, weight loss, increased stress of any kind, (family, partner, death in family, bills, etc) can cause irregular cycle and your symptoms. Usually will happen at least once a ytear. Body will correct itelf without you needing to do anything usually. Consult doc if you develop pain in your right or left lower belly as you might develop an ovarian cyst. Happens.

frequent periods: This is not normal and there are many causes e.g. You may have an infection. Make an appointment with your doctor for a pelvic examination and checkup.