Possible symptoms

Hello, everyone. First post here.
So here's my situation: my mom and her 3rd sister have MS, and lately I've been pretty nervous on whether I'm going to get it or not. I'm a healthy 17-year-old male who plays soccer everyday in school, followed by a yoga class. However, these are some "symptoms" I'm experiencing:

Fasciculations all over body (mostly when lying down; twitches affect one area at a time)
Very brief shooting/stabbing pain in fingers and toes, sometimes legs (rarer, never at the same time)
Occasional forgetfulness and speech errors
On two occasions, my bicep had a stabbing pain when I'd raise my arm for a couple of days. I did nothing to agitate my arm.

What do you guys think? Am I overreacting, or do I need to be concerned?