My period still hasn’t come. Is it the leap year?

So I’m usually regular I was supposed to get my period the 25th or 26th of February eve is saying my period is 7 days late. I have no symptoms of my period coming I have very mild cramping on my left lower side. I took a pregnancy test and it was negative I swore it had maybe a faint faint line on there but I’ve decided I’ll wait and see if I get my period before I try again. I don’t know if it’s because of the leap year or if anyone is going through the same thing????