Given your symptoms (period missing, vaginal discharge and sharp pain during sex) you have to visit a gynecologist. Sorry, but without a vaginal examination, Pap-test, vaginal microbiological smear and gynecological ultrasound examination it can not be given a precise diagnosis.
A period missing could be the result of pregnancy (pregnancy test also requested) but it could also be due to the birth control pills you took recently.
In most cases, vaginal discharge is due to a vaginal infection. Not all vaginal infections could be diagnosed with a Pap-test so you need a microbiological examination for several possible infections (bacterial vaginosis, soor, Chlamydia, etc.). Certain genital infections could also cause irregular vaginal bleeding.
Painful sex (dyspareunia) could be due to many reasons including genital infection, tumors, etc.
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