Thanks for query,
Your period is from 15 th july .You have taken birth control pills up to 19 th of july & you bleed up to 23 of july as you have normal bleed associated with withdrawal bleed.
The bleeding occurs right now is not an implantation
bleed.It is just an extension of withdrawal bleed or mid cycle spotting.
The period scheduled on 7 th august has changes due to your hormonal