No Period at ALL!

My period is pretty regular but this month I haven’t gotten one at all (I’m 14 days late). I had protected sex earlier this month but it wasn’t around the time I’m “fertile.” To be on the safe side I also took a pregnancy test just to check and it came back negative... When I looked on Facebook last night and I saw this post. It later went viral and ALOT of people have claimed to either missed their period this month or got two periods! ... not saying I believe everything I see BUT a lot of people can’t just be having the same problem. I just want to know if there are others this happened to and what could be causing this?... I’m high key freaking out 😭