BFN but no AF

Kj
So this was our first month ttc after having a miscarriage in February. AF was due two days ago and there's no signs of her coming...took a hcg and not doubt in my mind it's BFN. Before my miscarriage AF was like clock work never failed...even my first period back from the mc it was right on and now I'm at cd 31 (normally a 29 day cycle) feeling confused/stressed/bummed and so much more