Can she be pregnant?: There is no way to know by the history you describe. Most likely not. But, once a period is late it is time to get the facts and stop wondering. It is time to do a pregnancy test.
Answered 1/30/2015
5.1k views
Unsure: Sexual intercourse the day before a period starts is not a very high risk time. However, regarding effectiveness of Plan B - it depends on when she took it. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours.
Answered 11/4/2018
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