Hello I took norethisterone tablet on the 11th June to the 14th June...my period was due on the 12th June but obviously due to taking the tablet I had my normal period on the 15thjune.My normal cycle is a regular every 24 days...on the rare occasion I may be early but never late....on the 3rd July....so 6 days early...I had a very light period for about 48 hours....going from this date I then should of been due my next period on the 27th July... Around the 18th July I started spotting on and off for about a week and I still don t have my period....is this a side affect of norethisterone? I should probably also mention that on the 22nd June I started back at the gym so I have had a change in my eating and exercising habits.