hello, I am 21 years old. My last period was August 26 as the first day. It's now October 3 and I still don't have my monthly period. I always have periods but it's always 2-5 days delayed, but i still have it. this is the first time that my period is delayed. I am not having sex but i had a flu last September 9. and is currently taking antihistamine every night. I'm also eating chocolates and make hot chocolate in the morning. Do they have anything to do with my late period?