@gerryserrano,
If I didn't think I was pregnant, I wouldn't change my behavior, either. So it sounds as if you had a more firm belief in the possibility of a pregnancy than she did - and it's her body. So, kinda wishful thinking there on your part.
But I agree that her drinking is troubling; it's just that you're hanging it on a pregnancy issue rather than what it should really be, which is a threat to
HER health, and not some hypothetical child's.
If you don't want to be with her, then don't. If you don't want to watch her potentially drink herself to death, then don't. But to only be concerned because you think she is pregnant would, at least to my mind, feel like your focus is more on a possible pregnancy than on her own life and health.
You dodged a bullet - but also recognize that the way you went about this was bass ackwards.