Reconciliation help on quickbooks

Hi, I am having some trouble with my quickbooks.

Initially I created the problem by accidently deleting an invoice that was related to a previous bank reconciliation.
This caused my opening balance to be incorrect when I tried to do the next weeks reconciliation so I tried 'delete previous reconciliation' and I stupidly didn't save before doing so!!
Now the opening balance is something completely different and I am hesitant to try and correct it further myself as I haven't worked with Quickbooks for long and I don't want to completely mess things up.

Please note - Our Quickbooks is not accessed online only on site


Is there anyway you can help?
valeria