@Sleeeeeepy - I've felt a bit the same, in terms of potentially accepting what we have.
It's been a really tough few months, facing the fact that it may not be possible to give our child a sibling.
I'd always thought of IVF as being the 'last resort' - so really panicked after discovering I may have a low egg supply (because that's not good for IVF). I've dreaded going through an awful, expensive process with a low chance of success.
But in recent days, something has clicked. Rather than desperately hoping, if a doctor tells us that it's very unlikely to work, I may actually feel strangely 'off the hook'. I may choose NOT go ahead with the expense and stress of IVF at all.
So that means accepting that if it doesn't happen naturally, we'll be a single-child family and make the best of it. No final decision yet, but I actually feel ok about it. Much calmer than before!
(Sorry for my long rambles - my thoughts have been utterly dominated by this stuff in recent times!)