I'm sure that finding out this way, after several months of trying to sort things out must be very frustrating. On the other
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Hand tremor, the good news is that you now know that you have herpes and can do something about it. This is in your favor. Furthermore your doctor had the strength of character to tell you of the failure to notify you. Sadly, some doctors would not tell you they had made a mistake but would go on and re-test you and then tell you you were infected. In my book, it takes a good doctor to be willing to tell you when they made and error or that they do not know something. There is nothing she can do to undo this. To change doctors at this point in the pregnancy may not be in your best interest but of course this is your call.
About the test and results. I am presuming that this test was done with a type-specific test like the HerpeSelect (you should ask). If this is the case, then you have both HSV-2 and probably HSV-1. (the test result means you do have the infection). There is no way to tell how long you had had the infection or where it came from. The knowledge that you are infected is to your benefit as it allows you to consider starting suppressive antiviral therapy in the latter part of your pregnancy as is recommended by the American College of Ob-Gyn in order to minimize your risk for infecting your child at the time of delivery.
Hope this is some help. EWH
A good starting point is WestoverHeights. They have a handbook that is very informative. There are also many people in the Herpes forum on Medhelp that can also help provide information and references for you.
Best Wishes!