What gives?!?!

Guess • 🔹Married to my high school sweet heart🔹Mom of three amazing boys, Maverick born Jan 2017, Arius born Sept 2018, and Draxton born Aug 2021

I stopped taking my birth control pill the end of May. My husband and I have not been trying but we also are only using the pull out method so I guess we are not not trying. (I didn't log all the times we were intimate well on here btw) well my problem is as you can see I'm currently 6 days late which is super unusual but I keep getting negative tests. Whats the deal???? I have tried to skip a period in the past by going straight onto the next pill pack and still got my period ontime my last two birth control free periods were on time so being late is not my norm. I have had two children and got pregnant both times within 3 weeks of stopping the pill.