Hello,
So I went with my OB yesterdady. And I told her about this, I feel like pinches, is not like cramps, but is like weird to explain. She heard my baby's heart, and the baby movements, she said everything was great! that those pinches are that my uterus is growing since is my first pregnancy that I have been this far I am 16 weeks today! :) I had 2 miscarriages; one D&C at 9 weeks and one natural miscarriage at 8 weeks.
She just told me to rest, and not be stress about anything, I guess our babies can feel our stress. :)
She said that if I get any type of discharge brown red or cramps, to call her right away :)
Good Luck!
Pains are pretty common the whole way through pregnancy, and it can be caused by a lot of things. If you're really worried and want to put your mind at ease, call your OB, have him/her check things out. Good luck!