TTC with PCOS can be tricky. I personally went and had all of the test done because I needed to know what we were dealing with and how we were going to approach it. I'm so glad I did because the state of my ovaries it was going to be an extremely small chance of us conceiving without a gentle helping hand. Plus I'm not 'old' but in fertility years I am as the OB put it getting a bit long in the tooth so if I wanted more than one baby I should really get a move on.
So you need to consider how old am I, how many kids do we want so do we have the time to let nature takes its course and how you feel about letting nature takes its course. It couldn't hurt to go and get the tests done so you have more information to make your decision.
Does any of that make sense???