will i slow down/ruin my milk supply by returning to a regular work schedule ?

Aimee • mama to a beautiful daughter and another one on the way ❤️

My first baby is due in november 2018 and i plan to breastfeed for about 18 months to 2 years. but i have to go back to my retail job after 12 weeks maternity leave. if i can’t pump let’s say for most of the day for 3-4 days a week, is my supply going to run out??