URGENT please help

abby

so I am not on birth control and my boyfriend pulled out when we had sex. I took a plan b on september 3rd and got my period after a few days early. now it’s time for the second period and I am 6 days late. I have had a yeast infection since my last period, gotten sick, and started working out along with being very stressed about two exams. could these be just outside factors or maybe making my period late?