my cycles are about 30 days, usually ovulate around day 15, I’m on day day 12 and have come down with flu or cold not to sure, but been ill since Sunday and now Tuesday where I’m feeling much better but just have the blocked nose but checked my bbt this morning like usual which is 36.09 and then took a test this morning, was shocked as it was darker than usual on this cycle day and then took one this afternoon and it came back even darker, can illness effect lh and cause a false lh surge, I’m not due to ovulate until Saturday, but if this is a true positive I don’t want to miss it.