AF was due 9/30!! Hasn't showed need advice

Kymber • •<3•happily taken •mother to a little girl infinity.•pregnant with baby #2 <3 •family is all that matters.
So I usually have a period every Month, well since I didn't start my AF like I was suppose too I still missed a period and a whole month so even tho I'm a day late... And missed a period for the month of September, could I possibly be pregnant I even took a test two days ago and it was negative? I already know I possibly could be just bc I missed the whole month of September! So I need advice!!