First of all - 6 months is well within the range of "normal" in terms of how long it takes to conceive. Secondly, a regular cycle certainly implies ovulation, but it doesn't always guarantee that it is happening.

A friend of mine had a regular cycle, but was completely anovulatory due to PCOS - they eventually conceived with no problems at all using clomid.

You may like to start temperature charting to see if the expected temperature changes that show ovulation are actually happening, or grab some ovulation predictor sticks and see if you can detect an LH surge.

Alternatively, if you are really worried, your GP will be able to arrange a progesterone level test which would be done around day 21 of your cycle to see if there is an elevated progesterone level - indicative of ovulation.

I hope this information helps, welcome to Belly Belly and good luck!

BW