I don't eat meat nor fish and I also try to avoid eggs and dairy products (it's not always possible when I'm eating outside). I graduated from veterinary medicine so I had to see how horrible the life of livestock animals can be... I think it is a very complicated matter and that most people are still eating meat because they don't know there is an alternative. I chose to be a vegetarian because I though that if I could lead an healthy life without condemning animals to a life of horrors so be it. I know some people that, like you, went back to an "omnivores" diet during pregnancy and I can't honestly judge them, yours and your baby's lives are what matter the most. Except, maybe, with some further information and with the help of a competent doctor that accept your life choice you can still have a healthy pregnancy and breastfeeding time with a vegetarian diet.