Unless she tells you there is no way.
A hospital cannot provide you with that information. It's against the law. In any case, what you want to do is an invasion of your friend's privacy.
A person's medical history is protected by federal and state laws, and anyone trying to bypass such laws will find themselves in very serious trouble. It is indeed odd that someone would be concerned with another person's very private issues. Making accusations and prying into someone else's personal affairs often ends up in civil litigation, so such things are better left alone.
If you are really a friend, you wouldn't push the issue, being somebody who recently miscarried, it did a lot of emotional damage, just be a friend and give them the benefit of the doubt. i don't know where I would be without my support system. but if you do find out she wasn't truthful... maybe suggest she get the help and attention she needs, because that is a horrible thing to lie about.
It is human nature when a good friend tries to tell their friend that other people are lying about her spreading gossip just as it is when a friend tells another their boyfriend or girlfriend is cheating on them. The messenger (the friend who wants to protect their friend) is the one who is going to get the worst of it, but good friends warn a friend so they are not hurt in the future. A friend that has been warned about people lying about her may think her friend is lying because of jealousy and therefore is in complete denial. Sometimes the friend in question re the people lying about her may eventually see the red lights going off and realize her friend is right or, she may end up having to learn the hard way.
If it wasn't too long ago you might still have pregnancy hormones in you and that would show in a blood- or urine test (as positive for pregnancy). if that has passed and you didn't see a doctor afterwards there is no proof. Otherwise you could have asked the doctor who examined you and maybe performed a D&C on you to explain.
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