Spotting... Cause?

Ok, so I know there are many reasons for shooting began periods. Just curious if abiotic had bad a simular experience.

I started fairly heavy spotting (all brown) during my ovulation time frame right between periods. It's been going on 4 days and I had two days with light pink and brown spotting to.

I'm just not sure if it's cause for concern or if it could be implantation bleeding when it's two weeks before my next period.

Curious for opinions.

So update... Did a pregnancy test and it was positive. Now I'm not sure if the spotting which started again with some pink to it... Is it a chemical pregnancy or could I still be pregnant. So u would a test show I'm pregnant if this is implantation bleeding?