Those look like males to me but the angle of the photos isn't making the ID easy. Regardless, without a visible gravid spot they certainly wouldn't be far along if they are pregnant females.
This video has photos of guppies in each stage of pregnancy with captions:
Stages of a Guppy's Pregnancy - YouTube
Also take a good look at the bottom anal fin - if it's rounded then they're females (see the pics in the video to compare). If the anal fins are longer, trailing or pointed then they're males.