Help please

I started my period on the 2nd of this month and it ended on the 7th. 4 days later I experienced light pink spotting. It lasted all day and then the next it ended and then 1 more day went by and the same pink spotting happens again but only when I wiped. Sorry if it's TMI does anyone have any suggestions on what could be happening? Is this a sign of pregnancy? I know it's not an std because I've been tested already. Please help..