I'm a bit worried about being pregnant, too... it seems pretty common.
I've been on it since may 2011, and I know it's in there, I can feel it. Anyway... lately I've been feeling: nausea at night, sensitive smell, exhaustion, aching breasts (mostly nipples), way more moodier, and just generally "feeling pregnant".
I'm overweight (close to 200lbs), and apparently that can make it less effective?? I'm having it removed on friday, and if symptoms persists I'm doing a PT next week/week after that. This feels much different than my previous side-effect symptoms.