I've been off birth control since last spring, just NTNP for like 6 cycles, then started making a real effort with OPKs/temping around Sept/Oct 2013. We are in cycle 5 now of really trying: well-timed intercourse, I know my cycle days, I have ovulation pain and I know it coincides with OPK positive and temp change.
Still no BFP.
I have a family history of endometriosis (my sister had a huge endometrioma and lost her right ovary/tube at age 27).
I'm going to a fertility doctor this Tuesday. Given the family history, and that I KNOW we are having intercourse leading up to ovulation, I think it's time. 12-13 cycles of unprotected intercourse usually gets you a BFP. Personally, I think the "rule" is 12 months under age 35 and 6 months over age 35. But if you have something to be concerned about, I think at 33 you should go after 6 cycles. less than age 35 is a big range, and 33 is not the same as 23.