I've been stressing over this so much!

first of all, my period was supposed to be on sept 9, and end on sept 13. I am now 9 days late for my period, and I'm really nervous. That day I was supposed to have had my period I felt cramping and some of the usual period feelings. It all happened in the morning only, but I didn't get my period.. I've felt some of the period feelings over the course of the week, and now I don't feel it anymore, and it's making me think I'll get my period :( but it doesn't come. I've been stressing out about it, being constantly worried about it. My bf and I had sex the day before the 9th and a few times the days before as well. We're both very careful about the condoms, always check for leaks or tears and he checks it during intercourse sometimes as well. I'm so scared that I might be pregnant. I don't want to be, I'm only 17. I'm going to take a home pregnancy test in a few days, but I want to know what you women think. I'm in a rut :(.