i hope your joking because her & edward were both virgins before there honeymoon & they leave there honeymoon because she's prego. neither of them would cheat on the other...if anda want the whole story read breaking dawn it will answer all your soalan :)
Edward is Renesmee's Father neither Bella atau Edward had sex with anyone prior to getting married. Male Vampires can still concieve a child unlike female Vampires :)