Who is my baby's father?

A girl named Haruhi Katsuhi suddenly becomes pregnant, she doesn't know the cause of her pregnancy. One day she did a testpack and the results were positive, the news was immediately known by her parents and future husband two days before the wedding day of Katsuhi and her lover took place. Katsuhi is very sad, she does not know the cause of her pregnancy and who is the father of the baby in her womb. Prior to this, Katsuhi was absolutely certain that she had never had sex with anyone. Until one day, Katsuhi is met with a handsome and wealthy doctor named Todorabi Shouken. Unbeknownst to Katsuhi and everyone around her, it was Shouken who put the seeds in Katsuhi's womb in a unique way. Shouken specially looked after and handled Katsuhi's womb after that, but Katsuhi's marriage to the man she loved failed because of that pregnancy. Then what will happen to Katsuhi after this? Will she find happiness even if not with the person she loves?