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I need your advice on faint lines and OPKs

Nicole • Thu, Nov 03

Hi ladies!!

So this is my 1st month using OPKs. Im on CD18 and my cycles range from 31-35. Ive had cramping on the lower left abdomen and pinching throughout the day. I took an OPK today (slightly diluted urine) and it showed a faint line. That was at 5:45pm. When should I test again?