Best friend full of it?

I love her dearly but a month or so ago she told me she was pregnant sent me a pic of her test and then a week later said she lost it but now she's telling me she thinks she's about 3 months pregnant ? And that she isn't sure she lost the baby because "most women have their last period just their first trimester" which I'm not buying Also when she was with her ex she was pregnant but after they broke up nearly a month later she lost the baby from him beating her. I've brought it up to her mom when I ran into her at the store asking how my best friend was because she was so depressed over the baby. and she was confused and told me that he left her because she was too demanding and said she was never pregnant .(my friend lives at home and told me her mom knew which is why I didn't see an issue bringing it up go her). And I don't know it's just frustrating because I don't know what to believe anymore.