So I woke you?

I wrote this dialog:

Man: I thought you were asleep.

Woman: I was.

Man: Oh, so I woke you? I'm sorry.

Question:

Is "so" very natural here? Also, do I need 'up' after 'woke you'?

Topstudent said:

Is "so" very natural here?

Click to expand...

Perfectly natural.

Topstudent said:

Also, do I need 'up' after 'woke you'?

Click to expand...

It's optional.

'Oh, so did I wake you (up)?' would work there too, wouldn't it?

Yes, it would.