Hi Rosa,

I have a 35 day cycle and I normally ovulate on day 20-21 so I BD every second day from around day 10-12 so we have some swimmers well on their way in case I miss it. I normally start doing my OPK's at around day 16 and do it every day at the same time and I also check for EWCM at the same time. This normally works for me and I always get a very dark second line. Sometimes the second line is darker than the control line then I know it is a positive. Any line fainter than the control is a negative. If I was you, with your 38-39 day cycle I would start testing with your OPK's at around day 17 at the same time each time you test and I would do it every day. If you do it every second day you sometimes can miss the surge. You should probably ovulate at around day 25 if your have a 14 day luteal phase. I hope this helps you a bit. Good luck with your TTC and may be both get the BFP we both wish for.

xxx Nita