Implantation or period

Amy • - mummy to Joshua

So my periods are irregular, I get them every month but each cycle can vary between 25 days and 33 days, this month I started my period on the 13th June (cycle day 1) I got a peak reading on my ovulation kit on the 28th (cycle day 16) which means I ovulated on the 29/30th (cycle day 17/18th), I dtd on the 28th, I’m now on cycle day 27th (10 dpo) I tested this morning and got negative....however this last night /morning I am cramping a little and have started bleeding, it is very light and pink mixed in with cm , my period isn’t due until between 11th and 13th (going on how many days I normally go between ovulation and getting my period) ...so my question is..could it be implantation bleeding or the start of an early period. Hoping for the first however it feels like I could be starting my period 😭