Since you use condoms for birth control, consider stopping the birth control pills for regulating your period. They could have devastating effects on your health later. The iodine and support nutrients -- B vit, magnesium, vit C, selenium, some zinc and boron, fish oil and some vit E, some vit A -- can have profound effects on your menstrual cycles. Support your health with these nutrients and a good diet, and you won't need an artificial means of regulating periods. Later, if you need additional support, have your thyroid status checked out. Aim for "optimal" values, not "normal" values. But first support yourself. Your future self will thank you :) Bless you for starting now.