Sounds like you caught it early. You should be happy that the I/O was completed less than one week from when the ultrasound confirmed the mass. I'm in the same situation and it was three weeks from discovery to left I/O (which was completed on Thursday).
At this point all we can do is wait. Focus on healing from the surgery and don't go down the "what if" path. It will only lead to additional stress on your body.
If it's cancer then you will get referred to an oncologist who will discuss options. Until then, just try and relax. I recently picked up a copy of Skyrim and it has helped pass the time =)
Wishing you a speedy recovery and positive results!
28 Years Old
March 15, 2012 - Discovered lump on LT.
March 30, 2012 - TC Cancer confirmed.
April 5, 2012 - Left I/O (AFP: 15.3 b-hCG: 47 LDH: 80)
April 20, 2012 - Chest x-ray clear! <3
April 28, 2012 - CT clear! <3 .. markers normalized
May 8, 2012 - 100% EC (1.4x1.1x1.1 cm) pT1, Nx, Mx
May 8, 2012 - On surveillance!