Ovulation/AF confusion!!

Really need some input!
My last AF was February 14-16 first real period since stopping birth control in January. According to glow I ovulated on the 28th of February, and AF would be due March 12th, it is now March 18th and no AF and all BFN's.
Now is it possible that I ovulated late or have a longer cycle that would make my period actually due today instead?? Can someone please please explain this to me??