My last period was on 13th Jan. I am on Centchroman contraceptive. (Used in India). I did Urine pregnancy tests on 28th Feb and 13th March. Both were negative. Then I undergone beta HCG on 20th March. It shows HCG levels of 1.2. The result is negative. I have not got my periods since 13th Jan. what could be the reason. Is there any chance of pregnancy?