Was this before or after the pastry flan and deli cheese you ate and panicked about?
Hehe, sounds like someone else that worries as much as me (my first). Have you checked out the NHS pregnancy guides (google)? Why not have a read over to reassure yourself what is OK/not OK to eat before you worry yourself more?
As for any previous/potential mistakes, keep in mind that everyone makes them, and some people don't know they are pregnant for a very long time. If you have particular concerns, maybe you can present them to your midwife and see what they recommend.