Not sure whether its my period or not?

Zoe
So my AF was due 06/08 but I started bleeding on 03/08 but it's a really light flow compared to my normal period. Sorry for tmi but normally first 3 days I'm so heavy that I'm doubled up in pain and got loads of clots but this time started off so light that it was only when I wiped, then yesterday it was heavier but still no where near as bad as normal and today only light again. What on earth is going on with my body? Any help or advice would be greatly appreciated. Thank you for taking time to read all this I know it's a lot x