Have been TTC since June 2015, have had 2 chemical pregnancies one in July 2015 and one last month. At least I think that's what happened, AF was late, had faint positive test, then AF started and negative test a few days later. Had 21 day blood test on 4th Feb and result was low progesterone level so having another this cycle, again on day 21. Have been using clear blue digital OPK and getting high and peak days each cycle and also having AF so very confused! My cycle has recently changed from 28 days to 33 days so wondering if this could have something to do with it? AF due today but so far nothing, but negative first reponse test. Any advice, thoughts appreciated! ❤️