hi, i took norethisterone to delay my period on holiday, the thing is my period came three days early on holiday so i took the tablets three times a day for five days which made my period lighter and when i stopped them i bleed for four days, a month later now and my period is late by five days, could this tablet have affected my periods, i am trying to conceive by the way and i am actually going for ivf soon as i have hydrosalpinx in one tube and loads of adhesions, i need my period to come to start my treatment, oh i am 29yrs old, 5ft 5ft and 9 stone