Just looking for advice .

soooo... I’ve been on birth control since highschool and I am now a sophomore in college . sometimes I can be late taking my pills occasionally or miss one from time to time . well last week (monday oct.19) my boyfriend finished in me but I had just missed the pill the day before .. my period was due to come on today and it still came on does that mean I’m good ? like I was protected or should I still worry ? I took a test yesterday and it was negative and today my period came on like it was supposed to so .. yeah . would it have not came on if I was pregnant?