this happens to me regularly. I'm not charting because of it actually but have been watching my cycle since TTC in Jan08. Mine also seems to stick around for upwards of 5-6 days so found it too confusing. I don't regularly get the ovulation pain so even more confusing. I would say its normal and ovulation has only happened once. I might be wrong but I also find that if I've drunk more water than normal around that time, it can come back or continue for a few days. But that's just me. Good luck.