It is hard to confirm a pg via a POAS test with a feint line as it could be an evap line, like you said. Unless you can get a blood test (HCG) and u/s I'd rule out a pregnancy at this stage.

You really need to get a second opinion/referral for your PCOS b/c your AF or lack of is a concern. Don't be scared to challenge your GP, I've done it many times & by being a little more assertive/vocal I have gotten referred for blood tests and various other things that I might not have if I just went with the flow.