I mean 3 times in a row, not 3 days in a row, if I wrote that somewhere it was a typo.
You could do it the night of pos OPK, next morning, and again that night. Or, the afternoon of pos, that night, then the next morning or night. There's no point in DTD the day after ovulation, the egg is gone by then.
You should either DTD or have hubby release every 2-4 days in the months you are planning to attempt. Best sperm count and quality. There may be something to being exposed to his hormones so DTD inside may be a good idea for blue, but if you are worried about Shettles then just DTD in the early part of your cycle and release inside, then once you get to where you could possibly be fertile, have him start releasing on his own or do oral. The downside with releasing on his own is that it keeps T and sperm count lower than if he was actually DTD.