Yes, blood after Sounding is not a good sign..
May I suggest you get some Silicone Sounds and practice with those until you get the "feel" of where they are and just how much movement is required (if any), to achieve a "happy ending"
The Urethra does change direction at the base of your penis, so do some online research to find out the direction it changes.
I would suggest going to the Silicone Nozzles website and checking the info section.
Get a good quality Water Based Lube and be aware, they ALL WILL dry out due to the heat and friction when playing, so replenish often,
AND stay sterile, hands, Cock, Balls and Sound.
If you get a bleed when not sterile, that is going to cause a unnecessary infection, NOT good, even if you get your "Happy Ending"
Its not about the happy ending either, its fun playing to get there !
As I wrote, check info on SN website.
Giggle wont take you there, use DuckDuckGo search engine.