would you go see the doctor??

Took 7 months to get pregnant with baby #1 and currently trying for baby #2. Been a year and my period are pretty irregular. They go from 21 days to 50 days long. I'm 30. I don't want to go to the doctor and not get any answers or be told to just keep trying. Do you think I might legitimately not be able to conceive again for some reason? Should I go? I'm military and I don't know how tricare is going to respond to fertility treatment.