When Will Be Next Period Date As I Took Norethisterone?

Hi I took norethisterone last week from Monday night (period was due friday which is the day I didn t want it to! ) and stopped Friday afternoon. So 12 tablets in total. I got my period today. I m trying to work out the date of my next one as I m holiday during that week. But the phone apps aren t accurate as they don t have an option that says took norethisterone. Can you help me with dates please? Cycle is usually about 28 days and period lasts about 5 days. Thanks