Hi India44, just this week the same thing happend to me, i was on cd46 and i thought af was never coming to my place, i started having loads of cm so out of curiosity i did an opk and get a definate positive - only to have her come the next morning with avengance!!! I'm not sure why this happened either but i definately oed also - confirmed on day 21 bt. Mother nature i guess...........