Medically reviewed by Kiarra King, M.D. Key Points Expecting twins can rarely cause a false negative pregnancy test due to something called the "hook effect."It's best to test after a missed period ...
PregaTips on MSN
The science, timelines, and what to do instead
Waiting for a pregnancy test result can seem to take forever. The first week is often filled with confusion, hope, and worry. This article explains why you may not get a positive test in week 1, what ...
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