If I filed already, and it showed me "owing" and now with unemployment credit, I get a REFUND, am I required to send in the amount I originally owed when I originally filed (without the unemployment credit)?
See this from the IRS
https://www.irs.gov/newsroom/irs-to-recalculate-taxes-on-unemployment-benefits-refunds-to-start-in-may
No, you do not need to pay since your original return will show a refund after the IRS adjusts it.