Missed period just read please

is it normal to not get your period for two months? I was supposed to get it end of May but I had sex for the first time so I guess that’s reasonable but then I didn’t get my period all of June and it’s now July and I still haven’t gotten my period but the pregnancy tests I’ve taken have come up negative the last pregnancy I took was June 24th my period is irregular but this long without my period is like.. but technically enough I’m 25 days late if this makes sense