My sis in law 食燕窩 when her BB in tummy is abt 2 mths old, the BB size is normal before she 食燕窩, she 食燕窩 in the 3rd mth, BB size grew much bigger during that mth which is unusual, she stopped 食燕窩, then her BB size became normal again.
Shark fin is also not good for prenancy mums, because shark is deep sea fish, may get poisoned. I love Shark fin so I still have it once per mth.
花膠 is very good for mums during and after pregnancy.