Can stress postpone your period?

So my period is usually always regular and on time. I always have protected sex with a condom even though he cums inside. We have never noticed any rips or tears in the condoms. I was supposed to start my period on the 24th and I still have not started. Sometimes strong medication can postpone my period but I have not taken any recently. My question is about stress relating to your period. I have been really stressed about school, the holidays, and family issues going on. If anyone else out there has this issue, does stress postpone your period if it's bad stress? I had taken a pregnancy test on Tuesday and it was negative. I'm just really anxious and nervous that I could be pregnant. Any advice or answers would be GREATLY appreciated! Thanks!