First things first, congratulations. I know you have been wanting a baby for a long time.
Second, I am assuming you are taking Valacyclovir (Valtrex).
If you haven't already, switch to 500 mg twice a day (i.e. total of 1000 mg/day). Your immune system changes and blood volume while preggers make this necessary to keep OBs at bay.
If that isn't enough, follow your OBGYN's advice and think about doing it as a split dose (i.e. 750 mg in the a.m. and 750 mg at night).
There are no official studies that prove that Acyclovir/Valtrex are safe for pregnant women, but there were registries for pregnant women taking acyclovir / valtrex. (Most drugs never get tested on pregnant women for some obvious ethical reasons.) In essence, all the data that came back indicated that there was no risk associated with taking either acyclovir or valtrex when pregnant. (The data for acyclovir was better because that registry followed more women, but since valtrex is a prodrug version of acyclovir nobody is overly concerned).
Many OBGYN's recommend that pregnant women with HSV2 take valtrex during the last weeks of their pregnancy to avoid an OB during delivery.
Since you have had HSV2 since prior to becoming pregnant, you are at lower risk for passing herpes onto your baby because your baby will have received from you the antibodies for herpes. This protection only lasts for something like 2-3 months after birth, but it is in place when you deliver.
If you take valtrex up until you deliver it will reduce your shedding.
Trust me, once labour starts the last thing you will be able to sort out is whether or not you have an OB going on. When you check into hospital the doctors will look with nice bright lights down yonder to see if there is anything resembling an OB going on and carry on from there. They aren't going to be worried about some shedding happenining in your bladder. Subclinical shedding won't be a big concern since you will be on valtrex and your baby will have the antibodies as I described above. The only thing that will get the medical staff concerned is an actual visible lesion.
Women who contract HSV2 during their last trimester, especially those who have a primary OB at the time of delivery are at the greatest risk for passing herpes on. This is NOT YOU.
For what it's worth I did take valtrex throughout both of my pregnancies. This was my choice, and I do not claim it is the best choice for pregnant women. Both of my children are doing fine and I have no concerns that valtrex affected them inutero in any negative way. The doctors and midwives I dealt with were all very aware of my choice and voiced no concerns. I lowered my dose during the first part of my pregnancies to 500 mg daily and then increased it during my last trimester as I started battling OBs. I had vaginal births both times.
My last little point. About 25% of women who give birth are likely to be positive for HSV2 (if you go by overall averages), most of them will not know this. So there are a ton of women out there giving birth with no valtrex and no knowledge of their condition. It's a very rare occurrence for babies to contract neonatal herpes. There isn't a decent percentage for Canada, but the USA rate is 0.2% to 0.5% of live births (it's likely that our stat is a little lower on the whole).
I hope this helps.
Hoe eet jy 'n olifant? Bietjie vir bietjie.
(Translation from Afrikans: How do you eat an elephant? Bit by bit.)