Started LO on Bottle on Sun with EBM- wheres my milk gone???!!!

[Princesspowersparkle]

Hi All
Some background- Introduced my 17 week old to a bottle on Sun. The whole day we gave her bottles and I expressed twice (I'd already stocked up on EBM). Anyway, today I just don't seem to be getting much milk in at all. Usually my boobs can get pretty hard after 4/5 hours but today they aren't really doing anything. I have tried to express a couple of times and only managed to get 4oz each time from both boobs combined. (Usually I could get 7oz). What can I do to get the milk suppy up again? As DD is still pretty new at the bottle I want to still feed her quite a lot in the day on it but I know that the more she feeds on me the more milk I will produce. Does regular expressing have the same effect (ie: if I express after every bottle feed I give her will it be as if I were breast feeding her?)??
Does any of that even make any sense??
Any ideas anyone?

Thanks

So have you stopped bf altogether and just want to express?

No not stopping to BF, but want LO to be happy enough to take a bottle if we are out etc or so DH can look after her etc. The first day on the bottle I didn't BF her, and I'm gradually bringing it back in but want her to be really happy on a bottle.