Anyone experienced implantation bleeding on/around day 21 before? How long did it last and is there any cause for concern? I'm having light bleeding which is bright red but not heavy enough to be period. Am very worried.

Sorry but don't seem to me that it's implantation... a little too early ... last mth my period came way earlier than usual too which is quite out of the norm as I'm normally a 28 days cycle.. But of cos I may be wrong, all the best and stay positive :)