What does this mean, and is this weird?

I'm a 15 year old girl and I consider myself straight, but I do find the female body attractive and beautiful, I just don't connect on an emotional level. The weird thing is I am really really attached to pregnant women, both on a physical and emotional level. I'm obsessed with them and the mere sight of a pregnant woman makes me come. What does this mean? Am I bi or a lesbian or something? I don't normally care about labels, but I really am confused. What do you think?