The answer depends on the type of test. If you're checking for ovulation with a home test, it won't work when you're on the birth control pill. If your OBGYN or reproductive endocrinologist is doing fertility-related bloodwork or cervical evaluation, they'll let you know how long you should be off medication before testing. If you're looking at an HSG test, the Birth Control pill probably won't affect the results, but ask the person ordering the test.
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