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Pregnancy is less likely by intercourse 3 days before period and she took plan B as well. The symptoms might be due to the plan B pill which results in hormonal changes causing such symptoms.
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Thanks for the reply.
Most of the times they are accurate but home pregnancy tests are not 100 percent accurate. She can get a blood pregnancy test to rule out pregnancy completely.
Home pregnancy test is never considered 100 percent, possibility of false negative is always there.
Its almost zero or 0.1 percent. 3 false negatives are not possible at different time intervals as you did.
This can be hormonal.
Plan B pill can be the cause.
Yes it can..