can stretching hurt the baby?

Jaimie
So my husband is out of town so I went to take out  the trash. When I went to throw the bag in the big trash can I stretched a little more than I have been. Will this harm the baby. I've been having small crampy feelings the past few weeks and I'm trying not to be too paranoid because I've called my doctor so much I'm pretty sure they want to disown me as a patient. 
Any insight? I'm 17weeks 4 days.