Re eggs, someone mentioned that eggs are free of salmonella now. That's not strictly true - as i understand it, British eggs are from hens vaccinated against salmonella. so if you buy British (eggs with the lion mark) you can eat them undercooked. However, you don't know if restaurants etc. are using British eggs versus imports. Therefore I deduce from that that if you are making homemade mayo, ice cream etc with British eggs you are probably okay, but if you have them in a restaurant you won't know the origin of the eggs.
FWIW, I happily eat soft eggs at home, but don't when out and about as I don't know where their eggs are from. Not quite domesticated enough to make my own mayo or ice cream though, so don't have to make a decision on that
Re steak, I eat rare steak while pg, but not rare burgers. I lived with a cat for 11 years so assume I'm immune to toxoplasmosis, plus the risk is tiny.
I eat sushi too - isn't that a bit of a grey area as well?
FWIW, my philosophy tends to be where the risk is a few steps removed from the baby's development - so with listeria/toxoplasmosis it is the risk that a) I get it (very small) and then b) that I am ill enough that it affects the baby (even smaller). So I don't worry about that. But with Vitamin A from liver products, the retinol is known to have a direct effect on the developing foetus so I prefer not to take that risk IYSWIM. Not sure if that makes me sensible for using my own judgment, or a hypocrite for risking my baby with one thing but not the other