This partially randomized phase I/II trial studies the side effects and best dose of WEE1 inhibitor MK-1775 when given together with paclitaxel albumin-stabilized nanoparticle formulation and gemcitabine hydrochloride and how well they work in treating patients with previously untreated pancreatic cancer that has spread to another place in the body or cannot be removed by surgery. Drugs used in chemotherapy, such as paclitaxel albumin-stabilized nanoparticle formulation and gemcitabine hydrochloride, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. WEE1 inhibitor MK-1775 may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. It is not yet known whether paclitaxel albumin-stabilized nanoparticle formulation and gemcitabine hydrochloride are more effective with or without WEE1 inhibitor MK-1775 in treating patients with pancreatic cancer.