Could my husband be the childs father?

Kat • Been ttc for 2 and a half years
I found out that my husband had an affair with a women and now the lady has a baby and is stating that its my husband. Here is the thing, my husband and I have been having unprotected sex for several years now and I have yet to get pregnant. We actually started ttc 3 yrs ago. I plan on staying with my husband and we will be doing a home DNA test this Friday. My thoughts are that the child isnt my husband because we have been having sex with no protection, bc, or anything since 2009. In my heart i do not want this child to be my husbands because I am his wife and I suppose to have his first child. Not some woman he slept with and now she has a beautiful little girl. Could my husband be the childs father?

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