Terminations don’t affect your fertility.
Yes sometimes things can go wrong with terminations that lead to complications but that’s not common.
The very high chances are that the termination has had zero impact to your fertility.
Science tells us that it does not on the whole affect fertility and you’ve also had some insight into your own fertility to be told it is average for your age.
So the “my body might think I’ve already done it” makes zero sense and is an irrational thought. You need to stop on this path bc it’s destructive and will get you nowhere.
Yes fertility begins to decline in your mid 30s but so does bone and muscle density but we don’t see people having nervous breakdowns over it and in the gym night and day trying to replace their muscle deterioration.
I was in the same position as you -36, scared I’d never be a mum and just met a lovely man. We just went for it tbh, it felt right and it was right bc we’re still here 5 years later with 2 young children.
If your relationship needs time to bed in then some things you can do now are get your health in tip toe condition, lots of plant based foods, nutrient rich diet, gentle exercise and yoga, great for managing stress levels and building strength.
Read about fertility - not scary YOUR TIME IS RUNNING OUT - but real, good literature.
I read a lot about fertility and having babies and how it all works, being informed gave me a sense of control (true or not), it helped me feel more level headed to know the realities of how to make babies!
I’d also try to enjoy these years as much as you can, I spent about 5/6 years absolutely focused on having a child and now I have them I absolutely look back and think why didn’t I have more nights out, more holidays, more chill out Saturdays - I honestly think I wasted a lot of my own time and got in my own way.
It is really hard once you feel that pull, to try and quiet the voice. rather than being sad it’s not happening right now, can you try to look at this time like you’re working towards being ready for a baby - this isn’t wasted time, enjoy it, educate yourself, block out the doom mongers and commit to the idea that it will happen for you when your relationship is in the right place.
That said, you do have to make sure your partner 100% wants what you want and that you’re on this path together for the long haul.