The last day of my last period was December 29th 2017, a little over a week ago, and yesterday I just happened to get my period again... I was super sick with the flu like vomiting nonstop from late Thursday night to mid afternoon Friday. I am still kind of under the weather but I am wondering if the stress from me being sick has caused this weird period occurrence? Or could it be because I had started taking birth control pills right after my first period ended but had to abruptly stop since I was so sick?

Just trying to see what is the cause of this & if there is one.

Thanks!!