hello, i am 19 years old and I have always had normal period, with a cycle of about 29 days and around 4 days of menstruation. This month though, I already have 4 days of delay. I had sex for the last time about 2 weeks ago. The strange thing about this, is I have pain as if I were about to have my menstruation since 2 days ago and I took a spasmolytic medicine when they started, as I usually do, but there s no blood. I m really getting stressed I might be pregnant.