you're not the only one... married 12yrs here, 3 kids.
Nothing changed it more than having kids... When the kids are young, they take a lot of time, effort, and energy.. plus she's remembering how it felt having them... so that turns her off.
When they get to the "teen" years... you won't want to touch her for fear of getting another:biggrin::biggrin:
You said she "got pregnant" 7yrs ago.... so you have a 7yr old, or did something happen??
My wife and I have been on an "off/on" cycle... from July 09 to July 10, I could count the number of times on one hand (probably have a finger or 2 left). We had a lot of stress with all the crap happening with jobs, school, house, etc.
Now that that's clearing up, we've been at it more.. and have doubled the last 12 months in 2. I never take it for granted, cause I know the bottom could fall out any minute.. LOL.
Point being.. stick it through, talk to her to see if anything's bothering her, if she won't say.. you'll have to figure it out.
I lived the last 6yrs with a wife who liked it, but didn't "want" it. So I can see where you're coming from.
good luck