When should I test? Does my chart stand a chance?

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My cycles on average are usually 38 to 40 days. Sometimes shorter and sometimes a bit longer. Today is CD 34. I usually get lower back pain a day before to indicate my period is coming. So far I have not experienced any symptoms in the TWW. I have two FRER tests left. When would be the ideal time to test and get at least a faint positive?

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