late but negative? help plz

so ive been TTC for 2 months and my periods are always regular. today im 3 days late and i tested this morning but it was negative. ive only ever been late by one or two days a couple times but never went 3 days. i also got another cold 3 days ago the day i was supposed to start not sure if that means anything. anyone have any advice or mabie know what's going on? im confused i just want to either be pregnant or bleed so i know whats going on. im very anxious. thanks in advance