Ever since my partner and I started to have sex, my period has been very out of whack I'm 21 years old. And other that my current partner my cycle has never been this strange. I don't know if it's because I'm getting older and my body is still changing? Or I'm around my coworkers to much so we are all on the same cycle? But my cycle for November started 4 days early which was the last week of October. And this month (December) I was supposed to get it on thanksgiving day or Black Friday, I use Evee to calculate my period and it's supposed to be pretty accurate. But I started 4 days late.. Should I be worried or not?