Pain in bladder after sex ?

Had sex with my missus 6/2 Friday night, following night she said she was bleeding when she peed and had a sharp pain in what she thinks was her bladder.
Since then shes pretty much been bleeding every night, its 6 days later, she said it stopped for one day though.
I'm pretty worried bout her, and Ive told her to see a doctor, and was wondering if anyone could give me an idea with whats wrong.
Also, when she checked down there, she said it was very bloody.
And that has freaked her out