Just curious

This might be a dumb question but if I have a 3 day period each month and am on minipill and miss a pill the day after my period ended, is it possible I could have gotten pregnant those 2-3 days after if I didn't use a backup method? 1st day of my last period was June 9. I heard it possible anytime but some people can ovulate right after a period so just curious what the chances are. According to this app I'm due for my next period in 8 days but this app has been wrong before for me. Also those unprotected days was 9 days before "fertile "week. And my minipill is the only birth control used and we have sex every night and some mornings/evenings as well. I was 5 hours late the day after my period ended and never used any type of backup those next 2 or 3 days but I did continue my other pills at regular time.