I was just wondering about OPK this is my 1st month using them and i have been testing since cycle day 10 it is now cycle day 18 and i have had no +ve ones not even faint lines my cycles are anywhere from 29 to 36 to 39 days and just wondering if anyone has any ideas what is going on i test at around 2-230 each day and have no fluids or go to the toilet for 2hrs before. So am i doing it fight and i just havent o,d yet or what it is driving me nuts