I am currently 16 weeks pregs and although weather is wet, not too cold, so haven't felt the need to wrap up warm yet.
Last time, I was pregs at the same time of year but only got to 29 weeks so managed to keep warm in woolly poncho's until December when the boys made an early arrival.
However, I will still be (hopefully) very pregnant over xmas/new year, so all of winter really - what does everyone else do to keep warm and dry without spending a small fortune on a winter coat they will only wear for a few months?