10 weeks and weird stuff

So, I am 10 weeks today and something very odd happened. Shaun and I were laying down (my head on his chest) and I felt this weird butterfly feeling in my lower right side of my tummy. Now, when it happened I thought "OK most people can't feel butterfly movement until they are 15-18 weeks so I can't be feeling this." I tried moving around to see if it would stop, but it didn't. I know that I am very in tuned to my reproductive system (i.e. I can't feel when I ovulate) but this couldn't possibly be what I think it is, could it? This is just a concern. If it isn't that, then could it be something wrong????