When did you experience implantation bleeding?

I’ve been posting a lot!!! But when did you guys experience implantation bleeding? I spotted a pinkish/red color on the 22nd but only when I wiped and I haven’t had it again since then....as my luck goes now it’ll happen again and I’ll have AF....I took a test and it was negative...I have both blue dye and pink dye test. And I used the first response opk and got a positive on the 12th and the 13th was really dark...and we used pre-seed for the first time!!