I have used three different ovulation kits this month not sure which to trust. First I was using amazon cheapie I ran out. I began using first response ovulation test negative even though I have ewcm for 3 days. I tried a Walgreens digital ovulation kit to compare both said negative. Started feeling my usual ovulation cramping and soreness and of course ewcm. Then Saturday my cheapie ovulation test come in blazing positive a day after both of other test negative. Next day hormones decrease on my trusted ovulation test and cm become dryer. Next day Walgreens test says positive and first response is still negative. Three days post though ovulation the Walgreens test says negative and first response says positive. Anyone experienced this difference.. Also I had been BD for three weeks and not relying purely on opks. Thank you for any input!