Did I set cam timing correctly?

so I've just brought an 2011 200bhp xc90 and it was due a cambelt change, i found the job quite easy but have panicked my self abit when id taken off the cambelt i seen a very small mist of oil coming from behind the cam pulley whilst i was there anyway and i thought id need to take off the back cover to undo the 2 top water pump bolts. I had the marking all lined up and proceeded to undo the 4 bolts on the pulley, it did move it a bit but not much once off i didn't see any markings of a fitting position either on the pulley other than a pointless little cut out and the camshaft end has nothing, but i knew which position/holes it went back on at but i didn't mark it in the center if you understand. i cleaned around the seal and refitted the back cover and pulley. luckily it had the head bolt markings on the pulley of the bolts i removed so i fitted the bolt exactly back in them positions and once tightened i turned the pulley back on the cover mark. fitted the belt etc and carried out 2 full rotations all marking bang on. started the car and it runs fine. I've been driving around now its all good but because i just worry I've seen that there's a locking pin hole behind the vacuum pump for you to lock the cam i would of said is that tdc ? so my question is if id even off set that pulley a fraction how sensitive are these engines to ping a fault. if the cam seal starts misting any time soon im taking it all off and pinning the cams this time. its a lesson learnt! i know someone with vida and scanned it no faults at all which im buzzing about as is it has 200k on the clock. I've ordered a Haynes manual now lol thanks..