Cramps after period

Hi, i’m on the pill, and i have 3 days of bleeding then 2 or 3 days of brown discharge, the first 2 days i have cramps, then no cramps. This period, i had the regular 3 days of regular bleeding and then the brown discharge. But today is day 6 and i started having cramps yesterday and it’s still going on today. I’m just concerned because i don’t have cramps this long. Is something wrong? I do have Unprotected sex with the boyfriend, i take the pill everyday at the exact same time, so i trust it.