I used to love diet coke. I'm talking I would drink it all day, every day. But once I got pregnant I couldn't stand the taste of it and wouldn't go near it. Now I'm about to be 27 weeks and I don't drink it all of the time, but on occasion I will have one and it tastes awesome. I'd say it's just an early taste issue that comes with pregnancy. It will go away eventually, but water is so much better for you right now anyways.