I'm 29 years old, usually my cycle is 28, 29 or 30 days. For the second month it comes to me on the 24th day. I'm not pregnant, I don't take pills. I have no pain or other complaints. Sometimes I have more physical exertion. Years ago, I was late with a maximum of 5-6 days, but not earlier. During my last normal cycle, I happened to poison myself and vomit, I wonder if that could be one of those? It wasn't serious poisoning, just a slight discomfort. PS. Sorry for my English