Early years: Can't tell whether it's an OB or not, how to know?

First of all, thank goodness for this forum. Life savers. So, this is kinda weird, but I still don't know how to surely know whether I have an OB or not. I don't know what they look like when I check, and I'm slightly confused. I've also read on here that people will check consistently for signs of it before sex even if they don't feel any side effects, which makes me think that they can just show up without pain? My first OB wasn't that painful (super lucky, I know) and now I'm just confused about what to do to make sure I am clear. There is a little piece of skin that could so easily be it, or not, it doesn't feel weird when poked. Is it usually obvious for you all? In your first years of diagnosis was it easy to pinpoint whether you were having an OB or not? Should I just be going to my gyno every time I see something that may be it and ask her to tell me if that's a OB or not? Thank you!!!!