Oil Leak?

I've been keeping a close eye on the car since the drive back to Aberystwyth when I discovered the oil leak. It seems to be fine, the oil level doesn't appear to be dropping or anything so I am now wondering if maybe there wasn't an oil leak. Maybe the oil I found was from a car that had been sat in that particular parking space before I arrived? There's absoloutely no sign of a leak any more, so I don't know what to think. The only problem is the clutch does seem to be making some peculiar noises and I suspect it may not have long left. There's no way I can afford to even think about getting that replaced just yet, that'll be one for the parents I guess.