@1990s so in terms of eggs, there are really two factors in play: whether you ovulate (or can be chivvied into doing so with medication), and then the 'quality' of your eggs, which is a roundabout way of describing whether or not those eggs are likely to result in a successful pregnancy.
IVF Investigations will largely be looking at the first part, and for some women donor eggs will be necessary as they aren't, for whatever reason, producing eggs.
In terms of egg quality, there's less that investigations can tell you about that and it's often more a 'suck it and see' situation. Over time, a smaller and smaller proportion of every woman's eggs will be chromosomally normal and able to result in a successful pregnancy so eventually you do end up in a position where the possibility of success with your own eggs is very, very low and donor eggs are far more likely to be successful. I think the latest success rate stats are:
- 19% for women aged 38 to 39
- 11% for women aged 40 to 42
- 5% for women aged 43 to 44
- 4% for women aged over 44f
The same figure for women under 35 is 32%, so as you get older, you can see how using donor eggs (which will come from a younger woman) can help significantly lift your chances of successfully having a baby from what would otherwise be very low odds.
Personally, I'd say that at 38 I'd be giving my own eggs a go if it was possible to do so. (And, indeed, I did exactly that.) Cumulative success rates at age 38 would probably be pushing 50% over 3 cycles of treatment, which is a decent shot. In terms of the costs of treatment, donor eggs will add a lot to the cost of treatment, so unless the IVF Investigations reveal a clinically significant reason to go to that option straight away, using your own eggs makes sense, with the option to switch to donor eggs down the line if needed.
Using donor eggs also adds some emotional and social complexities that you don't have to deal with when using your own eggs. I am being very careful here not to say "why would anyone use donor eggs I'd they didn't have to?" because part of my own journey to using them was coming to realise that I'd love the special and unique child born through their use so much that they are in no way a 'second-place' option. But it's quite a complex thing to embark on, with considerations for what it will mean for your child throughout their life, so for what it's worth my advice on paper would be to give your own eggs a go (provided your clinic don't advise otherwise), and meanwhile start doing the work of processing those questions around donor conception so that if you find yourself at a place where it's clinically your best choice, you'll also be more confident in your sense of whether it's right for you. Best of luck!