Hello. I had taken medicine regestrone for late periods and my periods came on 1st december (7 days later after the actual time). And I have sex on 6th december (5th day of my period). And on ,9th and 10 th december I have taken regestrone as contraceptive pill. Is it possible to get pregnant as on 16th december I felt little cramps and there is slight bleeding for two days which is black brown colour? And on 18th and 19 th few spotting was there. Is it the symptom of pregnancy? Is it possible to get pregnant on having unprotected sex on 5, th day of my period? Or is it the symptom of early pregnancy? Or is that an implantation bleeding? And when should I expect my next period will come? On 2 nd jan or on 16 th jan.