Conception happens only near the time of ovulation. The number of fertile days in each cycle is not known, but there are many signs of ovulation which can be used to know when ovulation is happening.
Ovulation and Pregnancy Test Strips (HCG25-LH80), OPK Ovulation Predictor Kit Includes 25 Early Pregnancy Tests, 80 Ovulation Test Strips, 105 Urine Cups, Accurate Fertility Test for Women : Health & Household
Clearblue Digital Ovulation Test - 10 ct
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MomMed Ovulation Test Strips (LH60) with 60 Collection Cups, Reliable LH Surge Predictor OPK Kit, Accurately Track Ovulation Test, High Sensitivity Result for Women Home Testing : Health & Household
OPK Tracker Printable, OPK Test Sheet Template, Pregnancy & Ovulation Test Strips, Fertility Planner, Ovulation Predictor Kits, TTC Planner
Natural Cycles Ovulation Tests - 15 ct
Lh Surge Predictor Kit Ovulation Urine Test for Family Planning Baby - China Accurately Track Ovulation Test, Diagnostics Urine Test
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Clearblue Digital Ovulation Test - 10 ct
Ovulation Test
MomMed Ovulation Test Strips (LH60) with 60 Collection Cups, Reliable LH Surge Predictor OPK Kit, Accurately Track Ovulation Test, High Sensitivity Result for Women Home Testing : Health & Household