Confused

I’m new to really getting down and tracking my period. I was on drop for a about 4 years. I stopped a year ago. My doctor gave me birth control for a month and said if your body naturally give you one after take the one month of it you don’t have PCOS if not you do. But I had no cyst or anything in my ovaries and all my hormones were good. Well I got my period two weeks after the one with the birth control. And it was only for a day. Do you guys think it’s normal? Could i be pregnant? I’m so confused with things 😭