Why is it friends seen to disappear when you get pregnant. My best friend was all over me for two…

Why is it friends seen to disappear when you get pregnant. My best friend was all over me for two months after finding out and I'm now 4 Days away from my due date and not once has she bothered to message me. She's always out clubbing and getting drunk so now I can't do that I don't seem to matter anymore 😂😂