H1B Transfer while in India after successfull stamping with Previous employer

[myvoice]

I am in India now for vacation.

I got my h1b stamped recently on my passport with Employer A for whom I have worked for the past 5 years.

In the mean time I have transferred my visa to new Employer B. Got I797B as I am in India now

Can I travel with my valid visa stamping with Employer B I797B?

Should i carry termination letter FROM employer A?

My I797B starting date is earlier than my stamping date.

I have valid stamping from Employer X until 2020.

Plz advice. .. it's urgent...