I think it could go a bit lower in the short term (but that didn't stop me buying some more now anyway!) Hopefully it will starting bouncing back up at some point soon.
One method for trying to minimise risk when investing is so called 'dollar cost averaging', where you just buy the same amount at regular intervals. This way you don't need to try to second guess the market...as you can just ignore whatever the current price is :)
Same approach I used in my (then, all in the past now) uitf investment.