H1B petiton approved, any chances of rejection during stamping?

Hello. I have come to US on dependant visa and i had my H1 B petition approved filed via consultancy. I have got visa for 3 years. I am planning to visit India next year. Are there any chances for my visa getting rejected during stamping even with approved petition?

yes, you need to have a client letter with you probing that you have a valid work when you return.