Late Period And Stomach Acid My Period Is Late..Help....??

My period is late..Help....?? - late period and stomach acid

Well, I do not like sex .. but my friend and my fingers like 100% sure that they have no sperm in their hands, and he told me to go .. Concern, but still I had my last period and I'm young and I know that they are not planned until they are evolving. but I had severe pain and swelling in my stomach and I had been ill for the last couple of days and I have repeatedly pointed out bout my period .. could have resulted, why in the afternoon? and also have acid reflux if you have these symptoms and prevents me from thinking that I'm pregnant .. but I can not so alarming, and I consider myself to, and I wish that might come my time ... acid reflux, it is too late? Please answer all my questions .. I am very concerned ... thanks ..