My last period was 12/ 21/ 08... I'm usually pretty regular every 28 day last about 4 days tops. I lasted 10day some days spotting. some days really heavy with back pains and pains in my sides. my breast still feel tender and a PG test came postive. The thing is I had taken a plan B pill in the end of november. Is it possible I had a miscarriage and a test still say I'm pregnant? or what else can it be?