I am also worried about managing to be pregnant on the implanon! :/
I have an almost 2 year old, and I wanted to wait a few years before having another baby, and wanted a more reliable b/c as I had become pregnant with my son while on the pill. I had the Implanon put in on the last day of July this year.
I skipped my period in August, and had a 2 week period in September (2 weeks is long, but it was my usual heavy period). But since then, I have had no period. I had some spotting early this month that I thought was my period coming, but then it stopped. I was very surprised, I've never had true spotting, the only time I would spot at all is before a full period started. So that bothers me.
Then over the last few days, I've developed a TON of pregnancy symptoms. But its confusing because they are things that happened to me later on in my son's pregnancy! I have lower back pain and major rib pain, my ribs just ache and ache. I had trouble sleeping last night because of it. And I just feel weak, very tired.
I am worried that not only have I become pregnant, but there might be more than 1 or an ectopic. It just doesn't make any sense and there should be NO reason my ribs are hurting like this.
By the way, I have some extra weight, my doctor DID tell me that there is a very small chance if you have extra weight at all you can get pregnant on implanon. It has not been studied in people with above average weight/BMI. I assume that may be where I went wrong, even though I am not that bad, its the only thing I can think of. No positive pregnancy test via urine yet though, it may be recent. But the pain is ridiculous.