Hi have you consided joining fertility friend? even if you have an inconsistent wake up time you can use the temp correcter. It's not perfect but reliable enough to help determin o time. Also you could check your cervix position. it may take some time to get to know it intimately but if you are o'ing it should be high and soft. sometimes it is possible to get +tive opks at different times but if you can use atleast 2 different methods to compare with it may help your chances esp when you dont have a male DP at your beck and call. Good luck