When should you start taking bird nest and how much? Must be be fresh or can drink canned

I bought dried bird nest and double boiled it once a week from third trimester. My dietitician told me that there was no difference between fresh or can - the only thing with fresh is that you can control the amount of sugar. I did not take it earlier in my pregnancy as they say will have lots of phlegm. Do note that many people feel birds nest might trigger asthma as it is an allergen. However, there are currently no research findings indicating that taking bird’s nest during pregnancy will put your children at higher risk of developing asthma. Some say eating white fungus is better than drinking birds nest with regards to nutrition.