Hi OP, I'm so sorry about your losses.
Toxoplasmosis is actually reasonably common (something like 30% of the population have had it, according to a couple of sources I read), but just because you tested positive it doesn't mean that you actively have it right now, just that you contracted it at some point.
My experience: I tested positive when I was about 12 weeks pregnant. I then went for further blood tests to establish the levels of toxo in my blood. Looking at these levels, the doctor was able to establish that I did not have it currently, but I had had it in the past, and my pregnancy was safe.
So if you have had it in the past, you're now immune, and it's unlikely this will have been the cause of your miscarriage.
If you contracted it recently though, it's a different story. I have no idea how toxo affects early pregnancy.
Hopefully your gyno will be able to give you a more conclusive answer and you'll know a bit more.
Hope that all made sense. Best of luck to you.