I have always used advanced. However, this cycle advanced was giving me CD 13 as O. So I tried FAM and Research and they both give CD 15 as O. OPK method gave CD 14 as O. So I am now using the Research method, with an O day of CD 15 for me! I'm only 6 DPO and I already want to POAS. I'm going to *TRY* to hold off POAS until 12 DPO.

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