Late period...spouse is "fixed"

Missed my birth control bc it wasn't approved by my doctor in time because it had to be renewed. I was instructed to not take it for an entire month, then the day my period starts up, start again.. so I waited like I was told.......

And now I am 5 days late for my period!

My period has been on point for at least 6 months, give or take a day or 2! My spouse had been fixed for almost 10 years, so I wasnt worried about not taking a birth control, I only take it for a piece of mind.

Took a pregnancy test today just to make sure, and it was negative, is it possible it's a false negative? 😒

Just nervous. Help!