Can I still travel to USA as my existing h1b visa is valid till June 2017?

Hi,My existing h1b visa is valid till June 2017, Can I still travel with that visa as my visa extension is still in additional administrative processing(got 221g when appeared for visa stamping) however my new petition is valid till 2020? I never travelled to USA before.

Kindly suggest me on this asap…Thank you…!!!