LADIES PLZ HELP!!!!my niece just had sex for her first time n now when she pees she bleed ?

She just lost her virginity to her bf n she called me n told me she's been bleeding when she pees I thought it was cuz he pooped her cherry but she said its been going on for a week I really need to know what she can have ladies plz help me I'm so scared for her idk if it can b an std or worse plz plz plz I'm begging help me out