Took plan b and now my period almost a week late?

let me start by saying I've taken a pregnancy test.. it's negative.

back story, April 23rd my husband and I eloped. I follow my period and fertility very carefully since my copper IUS fell out about 2 months ago. The week of our elopement was my fertile week and the night before we eloped we went to a dispensary and probably got a little too high and completely forgot about the condom sitting on the bedside table.

So since the day ( Monday) after was super busy with the elopement, so early Tuesday morning we went and bought plan B.

The rest of the trip we wore condoms, so it' puzzeling and worrisome that I'm almost a week late..

Has anyone else had this happen to them after taking plan B?