UNCONSCIOUS S£X RESULTS TO PREGNANCY, WHAT DO I DO?

We had a housegirl in our house who used to either stays overnight or goes home depending on the level of work in the house.
One day my mother went to the village to her father’s house.
Left in the house was only me, my father and the housegirl.
During dinner, there was no drinking water so after dinner we asked the housegirl to bring water. She did and after drinking water I and my father fell asleep in different beds.
When I woke up it was 10am in the morning. I saw the two of us i.e. me and our housegirl lying on the same bed fully nak_ed.
I immedietly rushed out of the bed and called out to my father who was still fast asleep in his room to wake up. On arival, we then woke the house girl up.
She then told us that she had done all this by mixing sleeping pills in our water. She also said she took me to my room and dad to dad’s room and made me nak_ed and had se-xual intercourse with me.
Dad couldn’t hold back his anger, so he slapped the girl and threw her out of the house.
One month after that, she called to inform that she was preg_nant for me.
Now my questions are:
1. Does this child really belong to me?
2. Do I have to marry her?
WHAT DO I DO?