So scared that I'm pregnant

I had sex for the first time October 29th with a condom (during my fertile window) and I was supposed to get my period today. I haven't gotten it, and I'm kinda freaking out. I've had no PMS symptoms, my breasts are really full/kinda swollen, and now I'm just really worried. Even though we're both 17 we've been dating for 3 years and are both really responsible. He did cum inside of me but we checked that there was no rips in the condom afterward. Help?? When should I really start to worry and when would I need to take a pregnancy test?