Prolonged periods

TCC for the past 4 months with no success..period comes like clockwork every 28 days but my period duration is very erratic. Day 6 of my period today, and still so heavy that I'm having to double up on sanitary wear. Period can last up to 9 days. First few days brown blood and light. Surely after 5 months of being off the pill my hormones aren't still regulating? Anyone else had this problem? Il starting to worry something is wrong! 😢 any advice appreciated!