i had unprotected sex on 16th and soon had i pill within 30 mins and my period was on 28 december I'm confused can I still get pregnant because of the ovalution period

A. I have my doubt was mentioned that you had a tablet so the chances are not there but still if you do not get your cycle on time I would advise you to take a pregnancy test and if you find it positive and if you do not want to have it and check with the gynaecologist ahead of that