What about two periods?!

If it happens more than two months in a row, then I would check it out with your doctor, it can be caused due to low progesterone levels. He will most likely prescribe you birth control to regulate your periods and keep your hormones at a proper level. This happens quite often, so I wouldn't be worried. Just make sure to eat iron rich foods, such as meats, leafy greens, whole wheats and beans so that you don't become anemic, which is very common in women with heavy periods or in women who bleed more often than others.

Nursing

it's normal

Pheremones can do that to you, nbd.