Mommy hormones, Dad in Distress... other mommies please tell me what to do

Ok.. so I feel really weird posting on this site because I am not a pregnant woman, I am actually the other half, I'm the guy and I just found out that my girlfriend is pregnant. This has already become such a bigger issue than I ever imagined because of the turmoil that we are going through now. Her excuse now is always "well you should be more caring you f***ing ***hole!!! I'm pregnant!" and see the thing is that I AM NICE!! I am soooooo nice, I am more patient with her now then ever and I treat her like a princess... up until she starts cussing and screaming and putting me down and throwing things at me, and she thinks its an excuse to do those terrible things because she is pregnant. To give you an example today I had been acting so nice to her, then we were talking about a subject over the phone while she was on her lunch break and she felt as if she was the right one and so she replied "well that just shows that you are just an ignorant ***hole" this is one of her favorite names to call me, after she said that I restrained myself from saying something back but I raised my voice, as soon as I raised my voice she hung up on me (another thing she does because she knows that I hate it more than anything)So then I call her back and I start yelling and loose control and then all she can do is cry and tell me how bad of a person I am and how she deserves to be treated better because she is pregnant... but I just keep trying to tell her that there is not ANY HUMAN BEING out there that is just going to take that verbal abuse and say "hey its ok... she's pregnant" I keep telling her that I can be nice to her and treat her like a queen but only up until she starts putting me down and trying to hurt me. What am i supposed to do? I feel trapped in a situation where I cant do anything but keep getting verbally and physically abused. But to paint a picture for you she doesnt just call names, she reminds me of how she wishes that she never would have met me, or lost her virginity to me, and she tells me how im worthless because i'm going to college but i dont have a job too. Also when she's mad she loves to emphasize how I am a "skinny little twig" and EVERY time i buy her something as a gift she will tell me how she hates it as soon as we get into a fight... on valentines day I took her out to eat somewhere really expensive and got her one other gift, this took the last bit of money in my wallet for like the next week but all she ever tells me is how she wanted flowers and that i'm the worst because i didn't give that to her... nothings ever enough. Granted its not just one sided though, once she starts calling names and throwing stuff I usually fight back and call names... but This whole ordeal is just crazy

But another thing is that she is only 5 and 1/2 weeks pregnant... is she really even going through that emotional pregnant period or doesnt that happen a little further along in the pregnancy? It almost feels like she's having a placebo effect right now or something.

Oh and the last thing I'm really concerned about that i wanted to ask is that around a month ago (right about when she got pregnant) she had mouth surgery and so she's been on painkillers ever since throughout this whole time shes been pregnant... is this something to be concerned about? Anyways any tips or comments would be helpful... thanks