No worries! You are able to restore your contacts within Google Contacts - 

In Contacts preview

 Delete a contact: On the left, click Contacts. Point to the contact and click More more_vert > Delete delete.

 Delete a contact group: On the left, click Contacts. Point to the contact and click More more_vert> Delete delete.

 Restore contacts:

1. On the left under Labels, click More expand_more> Undo changes.
2. Choose a time to go back to and click Confirm.

In old Contacts

Remove a contact from a contact group:

1. Click the name of the contact and click Groups .
2. Click the group you'd like to remove the contact from (boxes are checked next to the groups the contact is already in).

Delete contacts:

1. In My Contacts, click the name of the contact.
2. Click More and select Delete contacts.

Delete groups:

1. In My Contacts, click the name of the group.
2. Click More and select Delete group.
3. Click OK.

Restore contacts:

1. Click More and select Restore contacts.
2. Select the time you’d like to restore your Contacts to. You can restore contacts to any point within the last 30 days.
3. Click Restore.