Does Intake Of Cerazette And Utovlan Cause Prolonged Heavy Bleeding Post Periods?

Hi I suffer from chronic migraines, often triggered by my period. To help this I was prescribed cerazette and utovlan. I started both on the first day of my period (as these were the instructions of the cerazette packet, the utovlan did not specify when to start it). My period carried on as normal for eight days, albeit a little light, however after the usual eight days it carried on and got heavier, also the blood is now a bright red colour instead of it s usual dark reddish brown colour, and I have suffered mild period cramps. (I also suffer from Ulcerative colitis so pain isn t unusual) I have now had my period for 15 days.