Period late after plan b

Maria

I was ovulating around the 14 of July .

Had sex the 26, condom broke but he did not finish inside yet just to be safe I took plan b within 12 hours.

My projected start date for my period was supposed to be the 28th.

It’s the 31st so I am 3 days late so far, is that normal???

And also when should I expect to get my period because I’m going on vacation August 4th and I really didn’t want my vacation to be ruined because of my period but now it will be😩😩😩😩😩