So i gave birth to my son over a year ago..

well for a good while my periods were irregular recently since February that got back to being regular. Coming on time, never late never skipping etc. But now I am 7 days late.. a whole week late... I did take a pregnancy test and its negative and i have before missed a period cause of me being overweight (but when that happened I had irregular periods ALL THE TIME)

idk. ladies should I rule out pregnancy or keep an open mind?