Implantation bleeding or menstruation?

Unprotected sex on the 4th of June, last menstruation period was on may 24-june 2, first i got brown sticky discharge last june 21, by june 22, it subsided. since june 23, i had this. Picture was taken yesterday (june 24). Is it implantation bleeding or menstruation? Today (june 25), im just having little red discharge (not as heavy as yesterday’s) Please help thank you#pleasehelp