[PyGame] Loading a image

[Help_me_Please]

I know this should be a simple one but when I run my code I get a blank screen before my game starts, the blank screen should load a loading screen I created in paint. This is saved in the same folder as my game and this title_page() is called after pygame is initialized. width and height are already defined variables that are the height and width of the pygame window. Can I please have some help loading in this image, pygame and time are already imported.

def title_page(width, height):
    screen = pygame.display.set_mode((width, height))
    title_screen = pygame.image.load('4 in a row.png')
    screen.blit(title_screen,(100,100))
    time.sleep(5)

Thanks for the help.