我已经怀孕8个月,马上就要生了,医生说很有可能早产及大出血,很是希望父母能够陪伴在身边,
this is one key point in your next letter to the Visa Officer, detail how your parents are independent and have inseparable ties to China, present all you have in Canada to ensure you can support them if arriving. either of or one of them.
recommend to get your mom only for this trip and reprepare your docs, in any case the letter to VO is very very important, everything else is what it is, there is no life or emotion in those froms, only the letter Talks to the VO what your concerns are and how you really really need them to help you in this life-saving condition for a pregnant woman, Mom is always the best one beside especially as per China's custom.
Share your next letter to VO with key infor and I believe many people would be more than happy to help make the letter more revealing and convincing and powerful to the VO.