I had something similar but the midwife told me it can be your body, abdomen and cervix changing shape and moving so your womb can expand and make room for baby. Hence why sometimes when you cough or sneeze you may feel little pains. Congratulations :)
That's pretty early. :>) With my first, I felt movement at around 17 to 20 weeks. Little flutters. With my second, it was more like 13. So, you may know what to look for when baby moves and I would say you can judge best if it is the baby or not. Some people would say it is too small but you're really the best judge. Happy Pregnancy hon!