why i am still bleeding after first time sex? it's...

Treatment of vaginal bleeding after intercourse:
Treatment depends on determining the cause and then treating it.
    In the case of inflammation, antibiotic is given and it may be necessary to electrocautary In the case of a abnormal tissue , it must be surgically removed . In this process may be performed under local anesthesia, which is cut surgically
finally if there any drug or medical condition that causes excessive bleeding must be diagnosed and treated
Diagnosis of vaginal bleeding after intercourse:
    Medical and clinical examination
    Ultrasound image  .
    An internal vaginal examination is performed where the vagina is opened and the cervix is  examined
blood test
Causes of vaginal bleeding:
    Vaginal infections are the most common cause .
    The presence of a vaginal yeast .
    The transformation of cervical cells into abnormal tissue.

Mostly, it is not a cancer, it is a local inflammation.
You have to visit a gynacologist for clinical examination and right diagnosis.