Laura Govan's been getting hated on since Tamar Braxton went ham on a woman who claims she got knocked up by Tamar's estranged hubby, but Laura says everyone's got it wrong ... and blames Gilbert Arenas.
Laura tells TMZ ... she's not a homewrecker or the "whore" who allegedly got pregnant by Tamar's husband, Vincent Herbert. Govan says she's never been with Vince, and on top of that ... she's not pregnant and is in a happy relationship with someone else.
Laura tells us the reason people think Herbert cheated on Tamar with her -- besides Tamar suggesting it online -- is because Arenas, her ex and baby daddy, started the rumor.