Please help

Ok this is for anyone to answer but I know there r some woman on here who also have this disease....I have endometriosis I've had my period since I was 11 and it has always been long and extremely heavy from start to finish....but I'm Jan. It was only 3 days then Feb. 7 days late and medium to light and this month it was 5 days late and it's been very light no cramps at all and even a different color... Has this happened to anyone else and if so what was is bc I've never had a light period in my life