Guidance please

I had my son last June and have been slowly breastfeeding less and less since starting work back in August. My husband and I have not been careful while having sex (I'm totally fine with getting pregnant again) but I haven't had my period yet. The other day I woke up with an achy pain in my neck/between my shoulder blades. I remember having this pain while pregnant the first time but didn't think of it as a sign of pregnancy. It seems weird that it is suddenly back. Should I take a pregnancy test or am I just having hopeful feelings?