It is not really “normal” for women to bleed after sex but it can happen and there are many different causes.
It may be something as simple as a bit of tearing or friction that happened during sex or that you were just finishing your period. But bleeding after sex can also indicate some more serious conditions such as a sexually transmitted infection or even cancer.
It is not possible for me to tell you what is causing your bleeding so a trip to a health care provider is a good idea. They will be able to take a full medical and sexual history from you and do a quick exam if they feel it is needed. They will also be able to advise you on any testing you may need such as STI testing or a Pap.
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Please leave a comment to let us know if this answers your question or if you need more information.