another period?

Kayci
hello ladies and some men that are on here as well! 
i have pcos and i take metformin. for a few months i haven't been taking it at night all the time and now i've recently noticed some odd things. 
i just had my period two weeks ago and i'm in my fertile window but tonight i just noticed a small amount of bleeding. 
is this another period? and is it from not taking my medicine right?
thanks to anyone that replies.