Implantation bleeding?

Anna 🥀🌙 • {24}SAHW 💍❤️ Pregnant with my Rainbow EDD 08-18-2025 🌈👼🏻✨ PCOS 💙

I have confirmed ovulation on August 4 my period is suppose to on august 22nd but I got up this morning and noticed I’m slightly spotting it was more pink when I first noticed it’s probably been a good 6hrs since then and it’s slowly gotten more brown. I’ve had random like twinges but no cramping, my boobs have been sore for about a week too. I started metformin this cycle so I’m really hoping this is it ❤️ when’s the earliest you can test after implantation bleeding or should I just wait till the 22nd?

Also I wanna add in I know implantation bleeding doesn’t always happen and can be rare, I had it years ago when I first got pregnant but it ended in miscarriage sadly.