Ob-Gyn questions? Ask a gynecologist online.
Thank you for your question.
The person with whom you had sex with on the 8th and the 9th is the person who got you pregnant most likely.
However we cannot be a 100% sure and you would require genetic testing to be a 100% sure.
The chances of person A being the father is unlikely i.e. less than 10% chances. More than 90% chances that person B is the father.
Let me know if you have any further questions.
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