When I was pregnant with my first, I nearly gaged on a grilled steak. I couldn't eat it, and I love a grilled steak. When our son was a year old, we went to our favorite burger joint and when I took one bite of my grilled burger, I nearly gagged. I couldn't eat it. I had the exact same reaction as before. We stopped at the drugstore on the way home for a pregnancy test. Sure enough!
When you are pregnant, your body requires more Vitamin B6. If there is diabetes in the family, or suffering from motion sickness this may indicate a need for more. Red meat needs a lot of B6 to digest, so your body was saying to save your B6 by not eating meat. I had 6 weeks of continual 24 hpd nausea. I avoided meat, ate cottage cheese, bananas, rice. This was 45 years ago. Now I would use brown rice, wheat germ, and other foods high in B6. Then, with my second child and more knowledge, I took 50 mg. a day of B6. Had no nausea at all except one day when I forgot to take it.