My sister was married by Feb 2017 . she checked for pregnancy by end of Feb 2017 , she got negative . also she have pcod problem so she was recommended to put dronis tablet and she had her periods . now may 2017 we went to check again for pregnancy She got positive . so we scanned But they said after scan that baby is already 3-4 months developed in her womb . now the problem is we have a doubt how she had periods while having a baby in her womb and will there be any problem for baby in womb since she used dronis tablet .. Please answer my question .