It's hard to say for sure from the pic, but I am fairly confident that it's female from your description. Hemipenes are developed enough to pop out from day one (popping is probably the most reliable in the first week or two of the snake's life since that is when they have the least muscle control). How sure are you that your Mojo is a male?

Here's a quote from VPI's website that my be helpful.
The hemipenes of hatchling males are little pink or reddish rods that pop out, one on each side of the cloacal opening; on most species they have a visible red blood vessel on their medial surfaces. A females may evert her cloaca and erect her scent gland papillae in response to the pressure. The scent gland papillae may appear similar to hemipenes (especially if no comparison is possible,) though they are always smaller, and they may have a tiny red tip, but no blood vessel is visible.
Here's a link to the page, as well, if you want to read the whole thing:
http://vpi.com/publications/determin..._sex_of_snakes