Hiya Kyle. I fell for you because it can't be easy watching someone you love have an ED, particularly double the worry because of the baby. Have you tried gently talking to her about it? about the possibility of getting some professional advice? It took me ten years to admit to my eating disorder but when I did, it was such a weight off my shoulders and made me finally believe that I could beat it. I had my ED when I was pregnant with both of my children but I managed to stop because all I could think of was the effects on the baby, so maybe your girlfriend is managing to control it a bit more during pregnancy and if not, then now is the perfect time to start trying. It's not easy and I hope it works out for you guys, but remember that she has to want to help herself, you can only do so much. Encourage and support her but let her make the descisions. She sounds like she's lucky to have you, I don't know where I'd be without my hubby. Take care Kyle.

Aaaargh I'm such an ass I meant to say feel for you not fell for you!! whoopsie

I read your profile and apparently your girlfriend admits that she has an ED since she's seeing a therapist. That's a good start. Do you think she would let you come to her sessions. Tell her how worried you are, how much you love and need her and that you want to help her, not police her.
If you think she is suicidal you should bring her to the ER and they could admit her to the hospital to make her gain weight. I'm usually against forced admission and she will probably hate your guts for a while, but this is a special situation. You would save the two lives that are most important to you and maybe it would give her a chance to open up about her problems.