I was married loooong before my first pregnancy but personally, I would wait. Had I fallen pregnant 3 months before my wedding with the pregnancy I had with DD I would have been 12 kgs lighter, unable to stand, being wheeled down the aisle attached to a drip and spewing

You might be super lucky and glow and be all awesome pregnant but what if it isn't like that! Be devastating to organise all of that only to have it go pear shape.