Hi. I am 18 and had unprotected sex for the first time last april 6. He did not finished inside of me for we only did it in a span of less than 3 minutes. He came outside of me, away and far from where my vagina is. I should have my period now for i had it on the 18-23ish of march last month. But it still hasn t come. i am NOT experiencing: Nausea, headaches, strong aversion to some odor, spotting. Nipples are sore and mild cramping (I usually experience this right before my period is about to come or when i am having it). My friend told me that having sex for the first time delays the period and that worrying and stressing about it adds up to the delay and yes, i am dead worried and stressed about it. Could it be contributing to the delay?