AF or implantation? Please help.

Hello! My period is due in 4 days. Yesterday I had two cases of bright red blood (tissue full), since then it has been brown or pink and very small in amount. Could this just be the start of my period?

I haven't been tracking anything as I haven't been trying to get pregnant and in all honesty don't want a baby (this is the first time we have even gone near each other in well over 6 months so it never crossed my mind). It's only when I remembered that I came to check the app that can you believe we did it 3 days before I ovulated, I could slap myself.

I did a test and there was a suuuuuuuuuper faint second line, it wouldn't pick up on the camera.

Praying for my period but would like to know any opinions. Thank you!