Re: are these pin worms?

Well, unless you ate a lot of grapefruit without digesting the fibres and breaking the fruit cells that hold in water, that looks a lot like animal cells!

It looks like they have flat middles..?

Here's a decent page of images, separated by worm type: http://www.parasitecleanse.com/GALLERY.HTM
More images, with typename:
http://www.udel.edu/mls/dlehman/medt372/images.html

More complete information, with images (check the righthand sidebar too)
http://www.parasitesinhumans.org/pictures-and-videos.html

Make sure to save a few of the specimens in a plastic bag, you might wanna refrigerate it, so you can make a closer inspection. Tweet