Implantation

Every app and Calculator says I O on the 16th! Only one says the 17th! My period are 27 days apart and last 6 days. (Been off and I’m trying so I didn’t confirm O this Month) On the 21st I experience very light water pinkish discharge and nothing after that and tonight I had a little pink dot on my toilet paper.

Do y’all lady’s think it’s implantation bleeding?

Pictures in the comments!