That depends: on when you took the pregnancy tests. If you just took one recently (closer to the 18 days) then it would be EXTREMELY unlikely that you are pregnant. Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; Over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives & other meds,
Answered 5/22/2017
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