I started bleeding during sex. should i be alarmed?

Depends: There are many causes for bleeding during sex. Some can be trivial and resolve with simple measures and some serious and need evaluation. A detailed history and evaluation may be necessary, depending on age, circumstances, local conditions etc, .

Bleeding: Post coital bleeding or bleeding during sex may be related to a variety of problems with the vagina, cervix or uterus. You should make an appointment to see your gynecologist for evaluation.