I need help

My last period was September 20th and it lasted 7 regular days that's how long it last always normally I have regular cycle I know I was fertile during week of October 1st until 7th Day mark of whatever day that was but I had sex October 10th we had sex condom broke I wasn't ovulating or fertile then but turns out I miss my period 4th day of it not coming on I took pregnancy test it negative so I wait week and take it again and it still says negative ??....I'm confused .... My birthday November 27th and I'm soon to become 22 so I don't know if my body changing up my cycle , if I need wait mid November and test again or go doctor .... What would you do ?...me and guy not together and I don't want baby right now if I am pregnant