Well it sounds like you are in a tough spot with all this. I haven't heard of a false positive for herpes although anything is possible! Does she get cold sores? she could also have HSV1 orally which could have been the reason for her positive reading. 80% of Americans have oral herpes (cold sores). Just a thought since you were unsure of what kind she has With that being said, whether she has it or not this is someone you have been in a relationship with for a long time, you two are having a child. Herpes is not a death sentence, but it is something you should think about if you are having second thoughts about being with her because there will always be a risk, might be slim in some cases though. For some people it is worth the risk because they don't identify the person with herpes, that is just a condition that they have. Now did you have these feels before you found out about her STD? Is that the part that is bothering you? I would sit down and think about the pro's and con's of the relationship itself not her condition. See what you come up with. I know the thought of it can be scary, but trust me there are so many great, amazing people living with this and we are OK!
good luck and I hoped this helped.