It's happened to me as well. Never a meat eater (other than seafood) and now I crave a big fat piece of red meat every other day. I never could stomach meat - and since being preggers I have an insatiable appetite for it. My DH thinks the transformation is hilarious. Will be interesting to see whether it tapers off once Gus is born. I've been bleeding constantly since week 5 of my pregnancy - so I'd say in my case it is definitely my body reminding me to take care of my iron/protein needs.