First time, it took me about 14 months to conceive. Was starting to get worried!! Went to the doc and she recommended trying ovulation kits (I had an irregular cycle, and it was difficult to figure out when my most fertile time would be from month to month, even with charting). After we started using them, it happened very quickly.
After my daughter was born, knowing that it could take a while for us to conceive, and knowing that we'd like kids close together, we just planned to "not try not to conceive" for a while. I conceived in my 1st cycle, had a miscarriage, and then conceived in either my 1st or 2nd cycle after that. WITHOUT charting or using ovulation kits or anything like that...
Sometimes I think if everything lines up right, it will happen. Sometimes that happens, sometimes it takes a while. It's worth charting and using ovulation kits etc, and it's worth seeing a doctor if it takes more than a year (if you're under 35 - more than six months if you're over) - but try not to stress about it (I know, easier said than done) because stress isn't going to help...
Hope it happens soon for you!!