Hello Jan, I am Dr. Arun and will be helping you today.If the bleeding is too heavy (need to change the sanitary napkin / tampon) in less than 2 hours; it would warrant an evaluation at ER. Otherwise you can wait and seek a routine appointment with your gynecologist. There can be various causes for bleeding after intercourse;
1) Infections like chlamydia, vaginitis, cervicitis
2) Cervical dysplasia
3) Cervix cancer
4) Cervical polyps
5) Vaginal yeast infection
7) Uterine polyps and fibroids
8) Injury during intercourse
A physical examination by a gynecologist and an ultrasound usually are able to determine the cause. Read the resource;
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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