Slept with my sister's husband and now pregnant. help?

Anonymous
My sister and I are BFF. I am married and she is also married. A few months ago, I hosted a party while my DH was away. My sister and her husband came. After awhile, my sister left. When everybody was gone. It was just my sister's husband and I. We drinking wine at the private pool. Flirting and touching each other. One thing led to the next and we slept. I am currently pregnant with my sister's husband's child and only he and I know about this. My husband was very excited when he heard the news that I was having a child and he becoming a Dad.

Please don't hate.
What should I do?
Slept with my sister's husband and now pregnant. help?
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