Why Don't I Feel Loved or Beautiful in My Relationship?

well after several different approaches, for at least 3 weeks, it's official, my bf does not want to have sex with me... i feel like that was the last thing i had to even offer, so now i just want to sit here & cry; it breaks my heart that I'm carrying *the love of his life* & taking care of our unborn son & I'm not attractive for that sole reason. please tell me I'm not the only one who feels like this... i feel stupid as hell for even saying this, but i feel absolutely horrible. why can't i be loved or beautiful?