Hey - I totally know what you mean. I was thinking the same thing by cycle 3, I thought "ok, well I'll probs get pregnant this cycle". Now it's cycle 8. But I actually don't think there's a problem. I think it just takes a bit longer sometimes. I think I'd start to be worried once it gets to 12 cycles.
The only thing that worries me is the age of my husband. He's 40, I'm 28. But still, you always hear about celebrity men having kids with their 4th wives at the age of 69!
In my personal experience, I worried more between cycles 3-6 and then kind of calmed down a bit. I guess because by now I think, ok! Well, it's been 8 cycles, surely the chances are getting more and more??!
I do understand how you feel, though. xxx