Yes, you can track your refund using the Where's my refund? tool.

Normally, refunds are issued in about 21 days. 

You are supposed to wait until your original refund is fully processed before amending your return, but since it has been more than 21 days already, hopefully it won't cause any problems. 

Thanks for your reply. I used  the "Where's my Refund" tool. That is how I saw that my refund was still in the " Returned Received " spot after 3 weeks. Then decided to amend a part of it because of a mistake. I thought the sooner I found the mistake, the better it was to correct it. Ugh! Hope I didn't screw it up!