Discharge 9 days before period

So sometimes I spot before my period but this was 9 days I did have unprotected sex but that wasn’t on my ovulation dates according to my calendar it was like 4 days after so idk if this is like a pre period because it’s only the second day and it’s only 1 time in the morning and then goes away so I’ll wait it out and see but I was just wondering if anyone ever experienced this because I know implantation doesn’t work that fast. It looked more pink yesterday but it’s very light in color