Your pizza was cooked, so I'm sure you'll be fine.
Re. the pasteurization/cheese issue - the concern is NOT whether or not the cheese was made from pasteurized milk. The concern is how hospitable the cheese itself is to bacterial growth:
Soft cheeses with a rind (such as brie, camembert, chevre) and mould ripened cheeses (roquefort, stilton) all provide a lovely place for bacteria to grow as they develop - they have to, their maturation process depends upon it. Pasteurization aims to ensure that only the desired bacteria are present, but if a stray listeria bug does slip through at any stage of the process these cheeses will give it a very nice home indeed.
Hard cheeses (cheddar, parmesan, red leicester) have a much higher salt content and, as such, don't encourage bacterial growth.
My understanding is that the current advice is that hard cheese is safe to eat (whether made from pasteurized milk or not) but soft, mould ripened cheeses should be avoided or cooked to eliminate the risk. As previously mentioned, the risk of listeriosis is very low in the UK - its just you're 20 times more likely to contract it while pregnant (but 20 times a very small number is still a very small number), listeriosis may go unidentified as the symptoms are often similar to flu or a tummy bug, and that the consequences for the pregnancy can be so severe.
Liver is a risk due to the high levels of Vitamin A (and the risk of listeriosis if its in a pate).
Everyone has different risk acceptance levels and will have a personal slant on the benefits and risks (one of the things I'm finding that makes parenting so much fun
:o). Just make sure you're making risk assessments on the back of the right data :)