Well, if you are investing on a regular basis (which you are if you're doing it weekly) then the price is actually completely irrelevant (Okay, unless maybe it 10x rapidly, but then you;d already hit your mark anyway so it would not be buying time ;) ).
This is easy math (Okay, maybe not that easy :D But it's math anyways :D). On average you will even earn more by regular investing regardless of the variation/fluctuation as if you were "waiting" for the right price, even if you will be buying for higher later down the road as the price keep going up.
It might be counter-intuitive but it's true :)
This all makes sense to me, trying to explain to 90% newbies here about that haha... there all emotional :)
Yeah, I know. Those humans with emotions, weird :D.
(Though I used to play poker profesionally so a small part of me actually genuinly finds it weird :that more people don't understand randomness and get emotional about their losses, and even wins :D )