dawn is just being silly and selfish toward that poor unborn baby, she even knows what sex it is, shes even felt it moving.
i have read that she hears about may and robs deciet and their plan that they have been using her for the baby, and rob is only with her because may has asked him to so that she can get the baby that she wants.
to hell with them, she should be strong, hold it up togther, and show them that she only wants the baby and that rob and may can have each other. but the writers have portrayed it like that so i supose the actress does not get to have a say about her character played by dawn