Missed period

Nicole

Okay so I know if you’ve missed your period, possible pregnancy. Last month for me I was crazy busy working and lacking sleep big time. During my period week of last month I bled heavily for a few hours and went away. Last week was my period week for this month and didn’t bleed or anything. I did take two pregnancy tests, at different times. I start my new pack of birth control today. Any thoughts of why my body is being whack?