Plan B..please comment.

I took plan b on the first of October after having unprotected sex...then on the 8th of October my bf & I had sex & the condom broke (I decided not to take another plan b pill after this). I had my period from the 17-20 but it was a lot lighter then normal..I have been feeling very dizzy, nauseous, & extremely tired/sleepy a month after I took the pill...has anyone else experienced any side effects similar to mine weeks after taking the pill? Should I be concerned?