My girlfriend and I had sex oct 30 just one week after her period ended and now we have to wait a month. She is irregular and she expects her period like around November 24-28. After we had sex, an hour later she took plan b one step and 8 days later she had a light period and the blood was brown a day after she had a cramp for just one day. Now we are worried, symptoms she may be pregnant? Is that how plan b works? We read about prengnacy symptoms but those are the only two she had. She doesn't feel dizzy and her boobs are fine etc! Is that normal?