It is common for women to get UTI's after intercourse, especially if they do not urinate when sex is over.
I also have a short vaginal canal, and my cervix will often bleed (not a lot but it does) if intercourse is to... agressive? But... I do like it that way.
Vaginal trauma? Well... yeah... but that doesn't mean you did it to her with malice. She participated, and she encouraged you, yes? She is also responsible for telling you if it is too much.
You can also do different sexual positions that would give her more feeling but with less thrust...
But like Martelo says, I don't think the act of having sex and orgasm is the issue.
