It is a possibility, but I wouldn't rely on just back pain as a sign that you're pregnant, it could be because you've slept in an awkward position or other reasons. But if you're worried, see your...
I definetely had back pain when I was first pregnant with my son. I ended up going to a Chiropractor the whole pregnancy. That was the only thing that helped.
Not to say it's impossible, but I've never heard of upper back pain being a sign or symptom of pregnancy(at least not in the earlier months.)I've heard of(and experienced) back pain(upper and...