Did my period just return?

Hi. I lost my period last November due to weight loss but have gained back to a healthy BMI of 20 and have been maintaining on this for the last 1 - 2 months. For the last 3 days however I've been having what I assume is a period!?! For the first 2 days it was really, really, really light and barely noticeable but yesterday it was heavier though it was still light (I used to have really heavy periods prior to losing them) but it was definitely noticeable and I'm quite sure it was definitely my period but this morning when I woke up there was nothing.. (my periods used to last 6 -7 days) please tell me it is normal for it to be so short when you get it back the first time?!?! Because I was SO happy and now...

btw, I'm 15 years old.

Thanks.

It was your period.

Thank you so much! I'm assuming that it will regulate itself as months go on then?

Periods change all the time throughout your life.  It may not go back to being as heavy as it was or maybe it will.  When I was 13-15 yrs old my periods lasted 10-12 days and were heavy. I started getting the Depo shot and after like 3 straight months of spotting EVERYDAY I never got it until I stopped getting the shot (which is what is supposed to happen).  Then I went off birth control in my mid 20's and I would get a heavy period lasting 5-6 days one month and then a light 3-4 day period - it would alternate, dependant upon which ovary was ovulating. 

Periods are reliant on hormones and hormone levels change alot throughout your life.

thank you for posting this, it gives me so much hope. I also lost my period last november but have not gotten it since. i was worried that i will have to wait like at least 6 months at a 20 bmi to see something. But yeah i heard that for it to count as a period it has to be at least 3 days.

my nutritionist said that a period is at least 3 days as well.

I also lost my period a few years ago, due to extreme weight loss. You are lucky it came back on its own. Mine did not. I had to start taking birth control pills to get it to regulate back to normal. Before I lost it, my periods were always really heavy and they lasted like 6 to 7 days. After like 18 months of no period, I went on birth control and my periods came back. They are totally different now. They are light and only last 3 days. Don't worry yourself anymore, just stay healthy and your body will take care of itself.