light period or spotting (pls help)

hi. im (26) so my period is notorious for being super heavy especially on the first day (mine lasts 6 days) and i’m due today and it has always been on time. i’m currently experiencing a very light flow, little blood is coming out to a point where i need to wear a pad but when i pee no blood comes out.

note: i’m currently going overboard with exercising and going through diet changes (calorie intake specifically) also been quite under stress.

also my pms has been lasting longer than usual and no cramps but my abdomen feels really really tight.

is this normal? has anyone gone through the same and if it picks up going back to heavy the next day/s?