Can I come back US by the H4 visa approved?

[lz]

Hi, All

I applied H4 visa then moved to Canada from USA. now my H4 visa was approved. can I use it cross the border back to US?

once I get back to US. can I use the re-validation to enter US once a month?

thanks

 

[lz]

anyone has this experience?

or anyone you know has such experience?

thanks