Weird symptoms...TMI

[Mlg9]

Hi all. First off I’m not Ttc but I’m having a few weird things going on and just after some advice.
I thought I started my period on Wednesday which would be 5/6 days early. But it turned out to only be a little pink spotting on and off for a few hours. So I actually grabbed an OPK (thought it was an HPT) lying about from trying a few years ago. And it was only a tiny shade off being positive. I know they also show positive HPT (they always have for me). But a few hours later I seen proper proper blood and again this only lasted a few hours and only when wiping. Only a little on a pad. So this has completely stopped now again and not had any spotting or blood for over 24hrs. Tried another OPK and it’s getting lighter.
My normal cycle is 28/29 days and I never deviate from that. I have the copper coil fitted so first few days are normally super heavy and then it fades to light flow after that and lasts five days in total.
I do think I ovulated mid cycle as I’m quite good knowing my symptoms.
Does anyone have any ideas what it could be? Surely if I’ve seen red blood it can’t be pregnancy?

I used to have a coil and a couple of times had bleeding just like this. Never got to the bottom of why, but I wasn't pregnant and have had normal cervical smears since etc. Think it might just be one of those things. It doesn't at all sound like youre pregnant, to be honest. Try not to worry about it and if it continues, maybe consider visiting your doctor or a sexual health clinic to have the coil checked.