Lots of nice modern and pretty tunic tops around at the moment asteroid which you can team with skirts, trousers or leggins. Bigger size clothes won't look right as they won't fit properly on the shoulders and will make you look frumpy. If you usually wear really high heels, I would buy some new ones with a lower heel and high heels can make preggy ladies walk very awkwardly. Keep your clothes fairly simply but also trendy.
Please don't wear hipster trousrs and crop tops! which fortunately seem to be around less than they have been for the past few years. They just look tacky.
What a lovely time of year to be pregnant. I wish you well.