I took plan b on November 10 after unprotected sex then got my period a week after (November 17)I took the pill. So this period was a week earlier than my expected period which is supposed to be on the 29th of November. Then yesterday (december4) I got my period again which is weird because I just had one two weeks ago. Now I am not really sure when I am going to have my next period after this one. Is this normal? Is it because of plan b? Should I go see my doctor?