I would give it two more months with the OPKs then go to your OB. You can do three day bloodwork at least.

I would give it 6 solid months of times trying -- so 2 more cycles. That was the advice I got at your age. I didn't have two kids, only one, who was also conceived on the first try.

Technically at a year, but in your shoes I would just tell my OB I have been trying for a year with no luck and then they will start testing, and refer you to an RE if needed.

At what point would one seek medical intervention/checkup for getting pregnant. I easily conceived my son and daughter (2nd month, and 1st month trying), but am struggling this third time. I've been off birth control for 7 months, and used opk's/good timing for 4 of those months. Still nothing... I am 33 and have a very regular cycle of 26-27 days.