Confused 🤷‍♀️ please help

So I was meant have my period in the 20th but it started a week early on the 13th with no warning, I hoped it was implantation bleeding but don't think it was now, normally I'm really heavy for about 3 days dark blood with clots and in absolute agony, but last week It was bright red for three days not heavy but needed tampons and no real pain which I thought was strange and hence why I thought originally it was implantation, so today's the day I should have come on my period (20th) and I'm having mild cramps and mild brown discharge occasionally but mostly clear, am I having another period even though I had one last week, I'm never normally like this and getting confused I'm hoping there is a small chance I'm pregnant but I think that's wishful thinking as so far I'm having negative tests, I had sex when I was meant to be ovulating (28th, 29th and 30th) but I now I'm not sure if I would have ovulated then if my period came a week early, any ideas? Thanks in advance