is this implantation?

Nattie • N V Cull
Hi guys so I posted 2 days ago about my pinky pale blood I had during and after sex, very light. Well anyway the next day after that ( TMI ) I had an orgasm but not through sex, through fingering... and well I went to the toilet and had a slight brown mark on my knickers then nothing else?  3/4 days til af... is this it?