Help how is this possible??

So I took a test two days ago.. Was faint positive.. Took a Digital clear blue... Was negative.. Went to the doctor had blood work done. Was told I had a chemical pregnancy. Then was told I have to wait it out til I miss my period.!! Af due tomorrow. ! Was told to wait it out the whole month n if I don't get my period I am supposed to go back n have another blood test and ultrasound done. I have no symptoms of AF.. What's going on? Or am I pregnant and levels aren't high enough?? So frustrated!! :(