Not all pâté will contain listeria, if it did it would be far more common as a disease, as Eurochick said above there are only a couple of hundred cases across the whole of the UK each year. So, I know it's not easy but try to relax.
I gave myself really stress over Xmas when I realised that the delicious cheeses I'd been stuffing my face with were mostly unpasteurised, but I stopped eating them and everything has been fine. I also ate haggis a few times around Burn's night which is also on the no-no list.
The guidance on the NHS website Squizita linked to is very good, but is written from the point of view of keeping all risks to an absolute minimum. However, I'm pretty sure that every pregnant woman has eaten at least one thing off that list at some point in their pregnancy without them or baby coming to any harm.
Also, the guidance changes a lot, my mother was advised to eat liver 2-3 times a week when pregnant with me, as were many others at the time, now we're told to avoid it entirely. The guidance is also very different in other countries and some of my European friends think the restrictions here are a bit mad.
So, what I'm trying to say is - you could drive yourself mad trying to avoid all the foods on the restricted list all the time, let alone all the things on all the different lists from different countries or even organisations within this country, but the stress you cause yourself won't do either yourself or the baby any good. Familiarise yourself with the NHS list, try to avoid the things listed if you can and if you feel ill go to your GP and get check out.