Did I mess up? I found out after my last-minute amend that I should have paid the taxes/gotten the refund before amending.

I noticed a minor error on my tax form when I was about to pay on another site (it was the wrong initial on one form. I was afraid this would have messed up the payment/identification process so that's the #1 reason why I didn't pay. Silly? I'm not sure if the main thing that matters is SSN), so I fixed it and amended right away.

 

...However, after I saw that 0 was owed. I realized that both on it and the amended return it said 0. And then I saw something worse on another site: that you should wait until you pay your taxes + get your refund. 
This didn't at all occur to me and I'm not sure if this is misinformation. 

 

Just how much did I mess up? Should I try to contact the IRS as soon as I am able? Or should I go through with the payment?