Me and my gf had unprotected sex (she is allergic to stuff in condoms) then she didn't know when she was going to have her period... We rushed to walgreens to get plan B and took it 20-30 mins after sex. She was expected on the 17th it was the 14 when this happened. She has experienced a headache, sleepiness, small to a but bigger period like cramps and a touch of tender breast. She normally experiences period like cramps before her period. Is this normal for someone who took plan B bc it says these are some symtops???