Skipped Period on the Pill

I’ve been on the pill since February of 2018 so a little more than a year. I am sexually active with my boyfriend but we don’t use condoms. Some days I do forget taking it though. My last period was in May 14-17. I didn’t have my period in June. I was really worried so I took a at-home pregnancy test twice (4th and 5th week after my last menstraution). I should have my period coming up this week. I ended up taking another test today and it came out as “not pregnant”.

Has anyone else had a skipped period while on the pill? I looked it up and thought it could be from stress from summer clases and life in general.