I took plan b jan 27 right after i had sex, used a condom. 7 days later i woke up with light bleeding and some cramps. am i pregnant? is itmy period?

Common: Plan B is 95% effective in preventing pregnancy if taken within the first 24 hours after sex but it does cause irregular /abnormal bleeding. This is most likely what you are experiencing. Now is the time to start a more reliable method of contraception and continue to use condoms to decrease the risk of STDs. Best wishes. Hope this helps.