Need not to put pressure on yourself. You are one of the best mom in this world as you have already tried your best to give your baby the very best in this world. It's really no easy to do breastfeeding in HK (lack of facilities + pressure).
Pump twice in the office and pump the excess after the morning feeding. Excess in the morning is around 6-8oz. During the day time, I am able to pump 16-20oz.