Implantation bleeding?? TMI

Celene
So me & my BF have been having unprotected sex. I got my period on May 2 & it ended on May 7. On May 10 I had brownish pink blood on my underwear & since then it's been a very light shade of pink when I wipe. Could I be pregnant since I just ended my period? I feel completely normal. Except I just starting experiencing very light cramps here & there. Has this happened to anyone?