I spoke to my vet when i was pg as my cat would bite and scratch occasionally, she (the Vet) was 16 weeks pg at the time, with her second, and she took no real additional precautions.
Like Kelly said you literally have to eat the poo (which is why gardening is bad, especially if you are a nail biter ).

But in saying that, if you are going to stress about it and cause yourself worry, ring your local vet and have a chat with them... if they cant put your mind at ease, go and see a GP, its better to that than worry yourself.

try not to worry