I came off Sertraline a couple of months ago after being on it for just over a year. It was absolutely horrendous coming off it. The worst thing I've ever experienced mental-health-wise, I think. I hated everyone, even the people closest to me, and was so angry and felt crazy.
The reason I came off it was that I still felt suicidal while taking it so I decided I didn't want to be consuming strong medication if I was still going to feel suicidal. I was also having really horrible night sweats.
Since being off it, I've noticed that my obsessions and compulsions are worse, which may mean that the meds were helping me a bit with that issue, but I don't think it helped my depression.
I think you have to make your own experiences really and I wouldn't tell you to not try Sertraline, but be careful and if you decide to come off it, do it 5 times more slowly/gradually than you think you should.
No idea about getting preggers!