Pregnancy weight loss

This may seem like a silly post. But oh well. If you are and have been losing weight and then get pregnant ... can you still continue what you’ve been doing and actually lose weight while pregnant? Before the weight that comes with the pregnancy inevitably happens? I weighed 220 back in May. I now weigh 184. So 4 lbs away from 40 lbs total lost. My doctor says I should weigh between 150-160 before getting pregnant and honestly I would love to weigh within that range just so that I have more wiggle room for gaining weight while pregnant without ending up right back where i started. However, I also don’t want to wait another few months for the weight to come off to start trying for a baby... any advice