11 doctors weighed in:
Cycle day 36. Pregnancy tests negative, no pregnancy or premenstrual symptoms. When do I go to dr?
11 doctors weighed in

Dr. Robert Kwok
Pediatrics
4 doctors agree
In brief: If misses 2nd period
A normal, healthy woman with monthly periods who then misses two periods should see her doctor. The doctor will likely repeat a pregnancy test, since pregnancy is a common cause of missed periods.
Other causes include hormonal imbalances that cause a lack of ovulation, or other conditions that prevent a normal period. Conditions such as excess weight loss or thyroid problems can also be the cause.

In brief: If misses 2nd period
A normal, healthy woman with monthly periods who then misses two periods should see her doctor. The doctor will likely repeat a pregnancy test, since pregnancy is a common cause of missed periods.
Other causes include hormonal imbalances that cause a lack of ovulation, or other conditions that prevent a normal period. Conditions such as excess weight loss or thyroid problems can also be the cause.
Dr. Robert Kwok
Dr. Robert Kwok
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Jin Packard
Emergency Medicine
4 doctors agree
In brief: Give it a day
7-day deviation from 28 (so, 21 ~ 35 days) is within normal.
Calorie-restriction diets and demanding exercise regimen can also cause periods to become infrequent or nonexistent. Physical or mental stress (even happy stress) can also cause you to miss a period. Home pregnancy tests are considered reliable when used according to package directions 1 week after a missed period.

In brief: Give it a day
7-day deviation from 28 (so, 21 ~ 35 days) is within normal.
Calorie-restriction diets and demanding exercise regimen can also cause periods to become infrequent or nonexistent. Physical or mental stress (even happy stress) can also cause you to miss a period. Home pregnancy tests are considered reliable when used according to package directions 1 week after a missed period.
Jin Packard
Jin Packard
Answer assisted by Jin Packard, Medical Student
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