Generally the most common day of implantation is 9 DPO. So either that day or the day after. It's very different for everyone though love. Some ladies don't implant until later and some implant super early!
I wouldn't stress about it too much honey xx At the end of the day, you're pregnant. When you get your first scan, it could even be off. I knew the day I implanted and he always measured 3 days behind that.
Congrats sweetheart xx Wishing you a happy and healthy 9 months xx