It is not only foolish but dangerous to consume prescription only medicines without doctors prescription. It is also illegal for chemists (most of whom are lay people owning a drug store without any professional qualification) to prescribe medicines. Norethindrone is not meant for termination of pregnancy. I suggest you immediately and urgently consult either a gynaecologist or an NGO like Marie Stoppe Clinic or Family Planning Association of India etc. to avoid getting into serious trouble.