Period or not?

I am on birth control via pill form and last month I started my period 2 weeks before my placebo pills then had another period on my placebo pills. This week (beginning last Tuesday) I am on placebo pills and spotted one day. Since that one day there has been no more bleeding of any kind. I am experiencing some minor menstrual symptoms but no cramping or bloating. I did take a pregnancy test and it came out negative sooo what the heck is wrong with me? 😔