Am very very confused - am at CD 30 (last few cycles were 24-26 days), 18 DPO (LP last cycle was 12 days and the 2 cycles before that 8 days), have been temping and had 18 high temps now - according to Toni Weschler's book TCOYF this means I should be pregnant. But have done HPT for 3 days in row now since AF late and have had 3 BFNs. Used 3 different brands of HPT (Clearblue, First Response, Boots) to see if different tests could give different results but all BFN. Oh and by the way - boobs are bigger, am peeing all the time, have been feeling absolutely exhausted for last week or so, getting small waves of nausea from time to time, and sense of smell is more acute. Could this still mean I am pregnant even though HCG levels not high enough yet? Could there be a problem if HCG levels not high enough when am at least 4 days (or 6 days) late now? Should I just end my misery and see a doctor? Have any of you ever tested negative this late after AF due? Thank you for any advice!