If this useless sperm donor has no interest now, I suspect he'll maintain that same level of interest after the child is born.
You might be wise to cease ALL communication with this lazy oaf.
What he doesn't know, can be of great value to you!
He could go to court to assert his paternal rights.
I doubt it.
Why?
Because, if he does, he could incur child support responsibilities.
Stop communicating with this waste of human life.
Advise your friends and relatives to do the same.
It might not help, but it sure won't hurt!!!