It's my first time taking plan b. my period after came on time but was super light. now my second period came on time but again, is light. normal?

About Plan B...: Plan B can alter the menstrual bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time, but not all the time. Periods should be back to normal after one more cycle. One can see her Ob-Gyn doctor if unusual periods persist.