My period came on twice in December and didn't come on at all in January, I had stopped taking my birg control pills but I recently started back, I was wonder would that be a reason why?

Rule out pregnancy. Hi Amanda. It could be that stopping and starting your birth control pills is responsible. Its also very common for women your age to have irregular cycles. However, it is important to make sure you're not pregnant. It's always recommended to use a back up birth control method the first month you start the pills. Your cycle takes a month to adjust to the pill and to prevent pregnancy.