I copied this from a website I have looked for information on.
• Cheese - it is only mould-ripened cheese that should be avoided i.e. cheese that has a blue vein in it or the type of skin or crust that is found on cheese such as Brie or Camembert
• Eggs - you only need to avoid raw or undercooked eggs
• All salad dressings that you buy or such as mayonnaise will have been made using pasteurised egg and are therefore quite safe. Cook eggs until the yolk and white are not runny any more. Be careful about eating 'home-made' products such as chocolate mousse which may contain raw egg
• Paté - all paté, whether made from meat, fish or vegetables should be avoided unless it is labelled pasteurised or UHT
• Fish - pregnant women should avoid shark, swordfish and marlin, and limit tuna to no more than two tuna steaks a week (weighing about 140g cooked or 170g raw) or four medium-size cans of tuna a week (with a drained weight of about 140g per can). This is because of the levels of mercury in these fish. At high levels, mercury can harm a baby's developing nervous system
Have no more than two portions of oily fish a week such as mackerel, sardines and trout.
Theres also this section which tells you what is safe and what isn't
http://www.babycentre.co.uk/pregnancy/isitsafeto