after my losses i had really silly opks for a little while.
i was also told to always use them between 10am and 4pm and NOT to use FMU.
in the end i decided i would test with opks just for fun and the month i concieved i actually Od around cd8! wouldnt be so bad but the test said negative, it was my temps that made it clear
i hope your cycles become more regular and clear soon