You will probably get odd pains, often like period pains, throughout the first trimester. As long as they are not horrendously painful, or accompanied by bleeding, this is nothing to worry about as everything's stretching and growing, as pp said.
Pinching and pulling pains are completely normal. In fact I see it as a good sign that your body is continuing to grow and get ready to accommodate the baby. I think you should only worry if it's severe pain which paracetamol won't sort. Good luck and keep asking away if you need to