Can plan b cause late ovulation?

Breanna • 28 years old, lost my first baby 💔 12/11/17 - 1/31/18 👼 Married💍 Mama 👩‍👧

I took plan b December 17th and my period showed up 5 days later, causing it to be a week early. This month my period was supposed to come Saturday the 19th and I’m almost 3 days late but bfn. Could I still be pregnant from ovulating later than usual? Thanks to anyone who responds!