I think it actually might. It's my first time/month drinking any sort of coffee and my period came a week or so late and I haven't been irregular in about 3 years. Good luck!
Can Coffee Delay Your Period?
Yes I agree, I have been very tired and I have been feeling like I need a red bull or coffee, and I am a few days late...
NO, but stress can and a host of other factors. People who are anorexic don't have periods. Hormone imbalances can mess up your cycle. Sometimes a perfectly normal woman will miss her monthly cycle for no apparent reason. However, the most common reason a woman might miss a period is that she is pregnant. If your breast are tender and you have cramping or feel under the weather then get a pregnancy test. If you are otherwise feeling fine and don't think you could be pregnant then wait a month and see if you start your period then.