Unusual period??

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I started my period on Saturday. I had very light brown pink spotting only when I wiped on Friday and it got slightly heavier on Saturday morning. But since then I’ve not had enough to even fill a panty liner, it’s only when I wipe and today, Tuesday, it’s almost non existent, only a small amount when I wipe. I’ve had a few small traces of blood, but it doesn’t at all resemble any period I’ve ever had. It also came earlier than my usual period, it wasn’t due until the 28th. I also had no pms symptoms like I normally do. Only lower pelvic and abdomen pain (not very crampy like usually) more like bloating and fullness. I’m just wondering if anyone has ever had something like this, if so, what was the cause? I’ll attach a pic in the comments.