I had a one night stand with my boss and he got me pregnant, what should I do?

I’m 25, so I should have known better. However, I keep trying to justify my actions by reminding
myself that he doesn’t have a partner, which is still no justification for sleeping with the boss.
I know he doesn’t love me – he’s made that pretty clear. “It’s just a bit of harmless fun”, he said.
Well, it just got serious. How do I tell him? And how do I tell my parents that I’m expecting a child with a man I’m not even dating? I’m the
last person they’d expect this to happen to!
I know I want the child, but part of me knows that I will be doing it alone. What do you suggest?