My last period was on June 23th and I haded unprotected sex with my boyfriend on July 3th and 4th and then on July 8th I started bleeding light pink then light red.so was it my period or implantation bleeding?

Could be implantation... would be a bit early for another period unless you tend to have irregular cycles. You'll have to wait and see when your next period is due. You can try a home pregnancy test a few days before and you might get an accurate result at that time, but many women find they have to actually be late for a period first.