Implantation bleeding, and how long until you can get a positive?

Kaylie

Had my last period August 1st -3rd, wasn't due to have another until September 3rd or 11th. Started bleeding out of nowhere yesterday after walking around mall. Didn't realize until got home. Was bright red but no clots, and has been only spotting for 24 hours. Could that be implantation bleeding or? My breasts have also been super heavy, sore, and tender since the last "period". Normally my cycle has always been late by 7-15 days, and last 4-7 days, this time came week early and bleed only 24 hours. So it's weird to have 2 super short periods in one month.

I have a child but it's been almost 3years and if I remember correctly I didn't pay much attention to my "period" before I found out, I just thought of it as a short period. HELP :)