The advice I have read is not to have too much caffeine, not avoid it altogether. Also, re alcohol, it is fine to have a couple of glasses a day apparently.
I can't help but (maybe stupidly) think that if these foods were so dangerous, humans should not consume them full stop. However, I still avoid. I have 1-2 cups of tea a day, I have had a (lovely) runny fried egg as I had forgotten I was pg, I had a medium steak by accident (I'd asked for well done) accompanied by stilton sauce (mw thinks its ok if its hot and who am I to argue?), I have had a few sips of DP's cider and - get ready to throw stuff at my head - Ive had a few tokes on a fag (gave up as soon as I found out I was pg).
I also suffered a mc with my last pregnancy, and had done everything right, as I had done when pg with my DS. I could put my mc down to the infrequent use of painkillers, the coke I drank, the extreme amounts of black mould in my old flat or could say its just one of those things. I'm trying to go with the latter, although everytime a painkiller passes my lips I worry.
Every woman who is pg is going to react to 'the rules' differently be it here on in France (where I'm sure you do get the odd woman who chain smokes and eats pate morning noon and night), some women stick steadfastly to said rules and have healthy babies, some unfortunately do not. Some women snort cocaine for breakfast lunch and tea and some have healthy babies, some unfortunately do not. We can only do what we feel is right for our pregnancy.
Good on you OP for sticking to what you feel is right!