Your cervix is closed before and after ovulation as well, it's not open all the time. Some women's cervixes look more open, or aren't AS closed if they've had a baby already.
This website shows how the cervix will look for a 30 day cycle and some. I hope this helps. Ohh I got this from the "Trying to conceive" group
If the link below doesn't work its www dot beautifulcervix dot / cervix - photo - galleries / photos - of - cervix (don't put in the spaces well i hope this way worked too)
http://www.beautifulcervix.com/cervix-photo-galleries/photos-of-cervix/