It's a very tricky decision to make. I didn't think about it much at all....I did have a burning need for children though. I wanted a child or children BADLY. It affected me daily...I was sad when I saw my sisters with their children because I feared I'd not have any.
You don't feel that...if you did, you'd know 100%.
You're ambivalent about it...
When I was faced with an extremely difficult decision (whether or not to emigrate to Australia) I tried to stop end-gaming...I kept trying to see the worst in either decision...."If I don't move and my child hates her secondary school, then I will regret my choice to stay in the UK"
And "If I DO move and my children don't settle, then it will be my fault because I tore them away from all they know"
And doing this is VERY unhelpful. It doesn't make it easier to decide at all.
In the end, I made the choice based on this....I had an opportunity and an opportunity missed was surely to be regretted.
As bringing a new life into the world is somewhat more serious than emigrating, your choice is even trickier.
So...I would look at it like this. You can still be hugely active and adventurous with kids. Of course it does affect your life...but you do get a special thing in return...a family.
How does your partner feel?