Closed with cup inside
Open with cup inside
Next to cup
The fallopian tubes are drawstrings. If I hadn't cut the entire stem off, it would've fit perfectly in the cervix. Hope this brought a smile to your face! :)
EDIT: Wow! Thanks for all of the nice feedback! I have written up a pattern (and tested it to make sure I wrote it correctly) and posted it on my journal: Uterus Cup Cozy Pattern.
For everyone who would like me to do the stitching instead, I have also crocheted a few more and put them up for sale on my (brand new!) Etsy shop.
Edited to fix photo links.