If you feel like your insides are stretching then it probably is the "GROWING pains" I felt like that around 16 weeks. And for a while now my baby just stretches.
Growing pains are less pain and more of an itching sensation that never really goes away you just learn to tolerate it I'm 16 weeks and my first pregnancy but my mom had 4 so I know from her and any bit of pain should be reported to your dr
14 Weeks today actually. ***