I went at 4 weeks 1 day I got my positive the day after my period was due so went that day so I could get the referral to the OB of my choice.

My doctor didn't bother getting me to POAS as he said they just use the same tests anyway. His words were 'a positive is a positive, I don't need to see it to believe you'. I asked to get my bloods done though as I wanted to check the HCG levels. In hindsight, that was probably a mistake as my levels were low so I worried for a few days while we were waiting for the next round of results to show they were rising.

I'd be inclined to wait until your period would have been due.