Implantation?

This is my Feb period diary, I came off my normal period on the 16th but then started having brown discharge on the 24th.. it wasn't enough to use a tampon and was no red in it, just brown. My periods have never been regular anyway so can't really track them but I've never had them this close together before! 
Would any of you say this is implantation or period? (Not on birth control, using the pull out method)