My symptoms are very similar to early preg symptoms so I always end up getting my hopes up
I usually get BAD period pain in my back anywhere from 1 day to 2 hours before I get them.
One month (when I was convinced I was preg) I had really sore boobs and was REALLY tired too.
I generally just get that back pain though and i'm a real moody bitch the day before.
Last month I had constant back pain before AF came and was 9 days overdue (which has NEVER happened before) and I thought I was preg (again) but wasn't. This cycle, i've had that same pain the last 5 days ago (pretty much since O but its getting worse) so i'm expecting them sometime soon.