I m 24 yr old female, my period cycle was changing from last 6 months, it changed gradually from 30 days to 39 days, bt after 27th July I haven't got my period, I have taken 3 home pregnancy test on 9-10_11 sep, I took one beta hcg test on 1sep it was negative and one on 23rd sep, it was also negative, I went to a gynecologist on 15th sep she prescribed me ethinyl estradiol 0.02mg and norethisterone 10mg for 3 days, it's been 7 days I haven't got my periods yet. Can i be pregnant and how to induce periods.