Plan b

Good morning!

Has anyone ever taken the plan b pill & it cause your period to be several days late? My period is usually every 21-22 days. I haven’t had any cramping or other signs that my period is coming. Only thing I’ve noticed are weird headaches that I don’t normally get around this time... wondering if I could possibly be pregnant. Going on 4 days late now and I took the pill a little under 48 hours of having unprotected sex