TTC thought i had implantation bleeding!

I need help here i had sex a week before my period thought what i had was implantation bleeding it was brownish pink for three days and then was only brown for a day now ive been bleeding for a week and five days still brown and some red with clots sorry for details im not sure if its implantation bleeding or a period but this is unusual for me normally my periods are heavy and lasts seven days please advice welcome!!!