Not a vegetarian but I never in my life had any particular interest in red meat until my first pregnancy, when I found myself dreaming about steak on a regular basis. No other particular food cravings or aversions really, just an incredibly powerful urge to eat red meat. And boy was it delicious. :yum
This time around the meat cravings have not been nearly as powerful though I would say they are still there. Both babies girls btw. (At baseline I eat animal products, mostly eggs and fish, maybe 2-3x/week. Like I said I'm not philosophically opposed to meat but just had never been particularly interested in it - I'd eat it if it was put in front of me. My sister calls it being a 'guestitarian' lol.) FTR I am always mildly anemic and continued to be so in pregnancy.
Honestly I do not think it is optimal for fetuses, babies and small children to have diets entirely free of animal products. Adults just need to do maintenance and repair but babies are building bodies made of meat. You have to eat a lot of tofu to build 8 pounds of baby, not to mention the micronutrient issues (B12 etc).
If you are truly opposed to meat but are willing to eat eggs (you say you are currently vegetarian not vegan right?), what about systematically incorporating eggs into your diet on a daily basis? Like two eggs every day maybe, and see how you feel in a couple of weeks?