Q: how can i view my contacts on my pc from my last backup?

Hi dubreuil1980, 

Sorry to hear that your iPhone took a bath. I know that it can be upsetting but lets see if you have a recent back up. 

Now you mention some recent phone numbers. Are these recent contacts or were they just numbers that called you and you haven't made them a contact yet? If the answer is yet to either of those, not suggestion below will walk you through. looking that information up.  

I will say that if you made a backup in iTunes, you can see when the last one was done. Take a look at the first article to go over how to look at that. 

Find and manage your iTunes backups
https://support.apple.com/en-us/HT204215

Now if you backup your iPhone through iCloud and use iCloud to sync your contacts, you can look them up at iCloud.com/contacts. If you are wanting to know when your last backup was done, you will only be able to find out if the phone has power or restoring your backup to a new device. Take a look at the next two links for more information. 

Manage your iCloud storage
https://support.apple.com/en-us/HT204215​

About backups in iCloud and iTunes
https://support.apple.com/en-us/HT204136​

Take it easy