DD1 was so exhausting between 2-3 that I never really noticed the being PG with here sister bit.
DD1 fiddled with everything in the adult world and climbed anything that could be climbed, toddler slide, big children's frame, bookcase, wobbly table, ladder left in the garden, tree. She wasn't fussed.
She showed no interest at all in age appropriate toys and ran off if not on reins.
I mostly forgot I was pg, I was so damned fed up of never finishing an adult conversation, because she was off up to mischief again.
However, she was utterly lovely when DD2 arrived and even tempered the vanishing a touch.
She's 15 and utterly lovely, a keen scientist, still fascinated by the world (and just occasionally she still fiddles and she has a dangerous hobby to replace the climbing).