"Should I tell him I'm Pregnant?"

Alright people.
Can we have your opinion on this?
So before they started, he had told her already, it's not about marriage so he wouldn't want her thinking anything along that line.
"But we can be friends, in fact, I want us to be very close friends or you name it lovers."
She had replied with a shyly smile, meaning approval.
So the journey started and they got closer and closer until...
Er... Erm...