h4 visa extention

[shwetasonu]

hi i am on h4 visa n im planning to go india in feb 2017 and my visa will be expire 17june 2017 .
so how early should i come back to us before my visa expires , so that i could avoid stamping in india.

my husband will file extention before i go , so i can carry extention letter with me.
please help me with this. Thanks