What Are The Chances Of Pregnancy After Stopping Norethisterone?

Hi I m 28 years old. I took norethisterone for 10 days to delay my period whilst on holiday. Stop taking it the day I got back and had sex with my husband the same day! This would have originally been when I would have been ovulating. I haven t had a bleed 4 days after stopping norethisterone, is there a chance I might be pregnant?