Jasdelta,
I have seen a wide range of wait times from reliable online sources. It was also a question I had for my doc.
One week has been frequently been mentioned, along with many shorter times. and a few much longer times. My doc was good with one week. Like picking a number out of a hat.
This assumes, of course, that the bladder is running clean - clear, no blood, no debris - and things have settled down. It was more like a month after my first series of 6 before things stayed settled down; that was the point that the one week wait started.
I was super concerned about passing anything to my wife - a bit OCD perhaps. I wanted to make sure we were BOTH comfortable with the return to sex without a condom.
Google "BCG cancer sex" for a wide range of timing suggestions.
Best,
Jack