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Did I O day of +OPK?

Amy • Thu, Apr 26

Hi ladies! I'm fairly new to OPKs and temping. Looking for help...So I got my first +opk this past Sunday evening with an internet cheapie then verified with CB digital. The following morning I got a blazing +opk. Then Tuesday morning back to negative. When do you think I O'd? According to FF advanced setting, I O'd day of 1st +opk. However with FAM setting, no crosshairs. Please shed some light. I have no clue! Been TTC for 8 months :( TIA!!!