1. Let me break it down for you TekNiKo and
@Karaboga :
A. The only time you can accuse a fellow Muslim of zina is if they admit it, pregnancy or or if you have physically seen them in the act and they produce witnesses.
B. Not all women have hymens. Also, even women that have given birth are rarely wide as a well, so committing zina obviously doesn't do that as the vagina is a muscle. What makes the whole conversation worse is that a lot of men are ignorant about women's bodies.
C. Also, some men might and will. There are petty men who might have issues with their new bride that will easily take advantages of this, especially if their goal is to publicly humiliate her. There are even men that leak their wives nudes for the exact same goal and you think a small % would never do that?
D. Islam is a religion that protects the rights of both men and women. What rights would women even have if a man can easily ruin the rep of a woman and her family because she didn't bleed or because he personally feels she's too lose because she might not have even been born with a hymen in the first place. That is a witch hunt approach in which anyone can point the finger at each other.
Anyways you can read this fatwa. This topic isn't one you can debate as our religion is pretty clear cut when it comes to this:
Read it. Also, that doesn't mean if you feel you're certain you can't quietly divorce her. But screaming she isn't a virgin when you have not witnessed it first hand will open you up to sin. That is merely my point.
Similarly, If I had strong suspicions that my husband wasn't a virgin due to him telling me he had girlfriends, I will not be allowed to publicly say he committed zina even though it might be obvious because he has not explicitly said he has committed it. I too would be opening myself to a huge sin.
All in all, do your homework before marriage and hope for the best.