So I completed DA:O for the first time today and I find myself "On the Road." So I decided to go have a look around and see what I could find, but when I zoned I was in a camp from ages a go, with Sandal and his father. All of a sudden I was talking to Morrigan about the Grimoire that I'd recovered and now I'm off to kill Flemeth.
 
Was I supposed to get this quest earlier on in the game because I've just watched Morrigan being spoken about months later in the mountains being pregnant?

Odd, you're only suppose to be able to access DLC content after completing the game.

And yes, you were supposed to get this quest earlier in the game.