I had my first DC 8 months ago. For one reason or another I've not had sex since, nor have I really explored my nether regions.
Did a bit of exploring earlier today and my cervix feels much lower than it used to - I've just checked again and I'd say it's about 2 inches in, although I'm sure it felt lower when I checked it earlier tonight. I'm having a total freakout - my mum had serious prolapse issues and had bits dangling out, and had to have pretty major surgery last year to sort it out. I just can't bear the thought. And I'm 33. 
I've not had any incontinence problems at all and so it hadn't really crossed my mind until tonight that there might be a problem.
Does your cervix ever go back up to where it used to be, or is it always a bit lower after a vaginal birth?
Is it possible to bring it back up with kegels?
Does 2 inches in sound low to you?
Does breastfeeding make a difference?
I haven't had a period yet. Will that make a difference?