Post-TIP/TSP is exactly where they start sleeping together in my personal canon, too. Their emotional intimacy gets even closer after that episode and... yeah... there's the baby pause of "You're not...?" that kinda seals it for me. His voice is so soft and wistful there.

*pets the Doctor, who so totally wants to have a little baby girl with Rose's smile*

I mean, even DWM thought that they'd at least been making out before "Doomsday" (they called her kissing Ten II in JE a way to compare and see that it was really the Doctor).