Thanks for consulting. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns. from your history the possible father can be the person who you had intercourse first before you ovulated. other methods are through blood group test. from the child and your blood group compared wit the father blood group. final resort will be genetic testing. Hope it helps. If you need further, detailed and quick assistance related to any health issues in future, feel free to ask me a question directly from my profile. Have a wonderful time ahead. Best Regards! Dr. Arunmozhi varman