Period 7 days late

Is this normal? My period has alwaysssss been regular and come on cue. However, this time it’s late and I’m a little concerned. I don’t think I’m pregnant since the last time I had sex was April 9th (on the sixth day of my period) and I still got my period on time at the end of that month (4 days early) and for May as well; both heavy if I may add. However, nothing for June when I was supposed to get it. Is this common? I’ve taken pregnancy tests to rule that out and they’ve all come out negative. What do you all think?