please help!

I posted this a few days ago and literally got no help.... I was on BC pill for a month got off of it completely had withdrawal bleed from November 28th-dec3rd and never got my real period after that.... Got faint positive tests and then negative doctor said I could be having a chemical but he didn't do blood work so I don't know but I don't feel preg or anything . What should I do? Is this normal?