DH knows about HPT testing, he really doesn't know about OPK testing, since I usually do it at work (whomever empties the bathroom trash at work probably knows more). He knows when it is FW and that OPK is positive, though because we have to plan BD since we are almost never home at the same time early enough to do it without falling asleep while doing.
As far as HPT, I tell him when I am testing. If I don't tell him, he asks.