wondering?

so im actually on here for a friend sounds wierd but im trying to help her get pregnant. lol Her ans her hubby hav e been trying n nothing :( she uses the period tracker app and i have this one for her. Ive noticed sometimes thw pwriod tracker cld b off or not make aence to us. ok her last period july 17 to the 20th but on aug 3rd she started spotting n having a light period very very light no cramping nothing. could this be (i was looking online) implantation i wonder or is this a eaely period. she took a test it was neg but its still (if she was) way early. anyone expwrience signs of implantation? and turned out prefnant