Birth control question

Cassie • Married my best friend ❤️9/30/17❤️ Two baby boys 💙8/8/18💙 11/20/19💙

I just stopped my birth control one month ago from today. I was suppose to get my period between Monday and Thursday this past week. Today I would have started a new pack, yet I still haven't gotten my period. I took a pregnancy test yesterday morning and it was negative. Is it just my body adjusting to being off the birth control after 5 years of being on it ? Been having unprotected sex for the last 2 months about every other day or so ...