I don’t know if this is helpful, but my DH does have other issues and we’ve avoided testing so far.
The first time it took us over a year to conceive and we considered fertility testing a little, but ultimately I became pregnant with my son before we had decided. The second time it was first try. But, this third time it’s taking a while again.
DH has had several strokes (brain stem), hormone imbalance and radiotherapy among other issues, so we’re pretty certain that although we’ve managed two lovely DC, our chances wouldn’t be great when analysed.
We felt testing before would make us feel a bit hopeless when we found out the lower likelihood. TTC is stressful enough as it is, but knowing the lower chances and adding more to it before trying naturally for a bit seemed a lot of pressure to us.
It’s a tricky one, we were younger with our first, but I’d suggest you to wait at least another few months. It’s not hugely common to become pregnant on your first few tries (though it seems everyone does but you when you’re TTC).
We tend to focus on all the other stuff around improving fertility first. Looking into the right diet (different for men and women), certain herbal medicines and improving fitness. We’ve also used IVI at home and a fertilily cup.
I think if you make all those changes and you’re getting close to the year boundary, that can be the time to look at testing. It also demonstrates to doctors you’ve tried every other avenue and that hasn’t worked.
It is quite likely to add an extra layer of stress, whether anything is found or not. If nothing is found, it’s the constant frustration of why nothing is working and if something is found, the anxiety about whether the solutions will work. There’s a lot of considering about the methods that will be best for you and so on. It’s just the start of a journey, really, and sometimes starting that too early can add extra stress to a situation that will happen very naturally without lots of extra help.
I do agree with pp that age etc are important considerations too. If it was a more major concern re health issues, I think testing early might be helpful, but it sounds very early to be too worried yet if both partners are fit and healthy.
Obviously, feel free to ignore this as you might feel very differently, but I wanted to share from a different perspective.
Really hope you get a bfp soon.