It really could be either one. I'd venture to guess that it's likely your husbands since you did have your period after the first encounter. But, bleeding in early pregnancy can happen, so it's possible that what you thought was a period, really wasn't.
The only way to be sure is a DNA test after the baby is born.
Does your husband know that you're cheating on him? I have to wonder if this is the best situation to bring a child into. You're obviously having troubles in your marriage. Babies don't bring couples together. If a relationship is already rocky, it won't survive parenthood.
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