This may be another way your mum force you not to have the Baby. Little girl, your life is still a long way to go. I am not sure how much you saved for your wedding and baby. Let's make it simple.
Wedding dinner - around 10 tables with others cost around HK$80,000 (assuming you are going to have it very simple)
After baby born - the cost per month HK$2000 (just standard thing)
I am not sure how much your bf earned and you will be, you sure you can find a job straight away. If not, is you bf still ok to support you and the baby???