I'm happy my wife had a miscarriage today and she's not pregnant anymore.
That sounds very harsh. Why are you happy she had a miscarriage?
The baby would come into this world and die, it's just way too sad to give birth to a baby.
I know that the world is very harsh, but life always finds a way to survive. Miscarriages are devastating to deal with and not something that you want to be happy about.
But I love having sex without the hassle of condoms or other contraceptives. Also, the baby was doomed before it was even born, so everything worked out.
If you don't want to have children, you really should practice safe sex. It's fine to not want children, but being happy about a miscarriage is offensive to your wife. This is a traumatic time for her.