Rosina,
I understand what you mean about mixed feelings. I'm the same!
I'm so fearful of birth, I have already had two antenatal appointments with midwives to try to secure my c-section (looks positive I'll be able to have one).
I also find myself worrying about global issues... like how we are in a climate emergency, and is it really fair to bring a child into this world when we only have 11 years to try to fix the environmental problems... etc. 
But at the same time, I've already mentally decorated the nursery 
To help get my head in a good place, I'm starting to do a pregnancy meditation every day. It might be nonsense, or it might be great.
As far as I'm aware, abortions don't affect your fertility (unless they go horribly wrong, which you'd know about!)
Fingers crossed you get your honeymoon baby! 