How long did you TTC before going to a doctor?

Me and my husband have been TTC #1 for 8 months. I track opk and body temps and just are having no luck. 😢 We are talking about going to the doctor and making sure everything is okay. But every time we talk about it I get so nervous and sick thinking that there may be something actually wrong and get to scared to call the doctor. I know I shouldn't be scared because there are so many options for us to have a baby if something isn't right. My question is When did you feel like it was time to start getting tested and figuring out what is wrong? Or did you try anything special that worked for you?