Stretching pains

I get severe sharp pains where the baby is located (17 weeks) when I stretch, like reaching up to get something in cabinets or stretching with yawning or in the middle of the night switching positions half asleep....
These sharp pains are really painful but only last for like 30 seconds or so.  
I'm a petite woman, 5 feet tall. (If that makes a difference)
Any of this happen to you too? I know that "pains" are normal but this always worries me. Like, OMG ow!! Is the baby ok!? wtf just happened!?
I know people talk abt loving being pregnant but I really don't - too much of the unknown and I'm always worried.