Birth Control

Between college and coming back home for the summer I ran out of birth control pills. With starting work right away I was unable to get an appointment in until about a week ago since I go to a health department to get my pills confidentially. In total I went 3 weeks without pills. I took my last pill the 26th of May and started my period the following week. I started taking pills again the 19th of July. The app shows my period was supposed to come a few days ago. So now it’s saying I’m late. All the time while off of the pill we used condoms and still pulled out. Anyone else go off of the pill briefly and have changes in their period? I’m thinking I’ll get it when I finish my pack of pills now but was just curious if anyone else experienced it also.