I dont eat any ham, bacon or anything. If i was going to eat it, would only eat it if it was on home made pizza, so that i could be sure that it was fresh, and cooked properly.
I know 2 peoples that had close m/c due to eating pork, and i have always been told that deli meats are bad, and i figure you dont know 100% what is in various sausage like pepparoni etc, so for the sake of not running the chance - i have completely avoided it.
In saying that, we dont eat a heap of brought pizza anyway, prefer to make it at home, much nicer. Dh and i got pizza at pizza hut just after my 15week scan (i think) and we worked out that it was the 5th time we had brought pizza since we meet in aug 02! And 3 of those times was because others where with us.