I Know My Now Boyfriend Is My Baby's Dad, But He Still Wants A DNA Test As We Weren't Together When We Had Sex.

Well I Had Sex With This Other Guy On July 20th, My Chance According To Glow Was 3%, The First Day Of My Last Period Was July 29th & Then I Had Sex Again With Another Guy (My Now Boyfriend) On August 13th The Day I Ovulated & Then Got A BFP On The 26th, Only Two Weeks After Having Sex. Is There Any Way It Could Be The First Guys Baby?