Deadsight (2018) on Netflix

Plot summary

A virus has spread across Grey County. Ben Neilson comes to in the back of an ambulance with partial blindness and no memory of arriving. The radio gives him no answer. Zombies attack, and he gets away to a farmhouse and hides. Mara Madigan, a police officer who is pregnant, is drawn away by a sick woman, and her patrol car is taken. She walks the road and arrives at the same farmhouse. The ambulance she hoped to use is out of gas: Ben had left its engine running. The two must now work together.