Can I travel to India when my H1B Amendment is under process, my visa is valid till 2017.

I am planning to visit in India during last 2 weeks of december 2015. My H1 is valid till 2017 and my employer is in California and I am in Texas. I am planning to file for amendment before I leave. Following are my questions:

1) Will there be any problem at port of entry, once I am come back and H1B amendment is pending?

2) What happens if my amendment is denied, will I be able to enter USA?

Any other advice will be helpful?