Hi.. I Am 12 Weeks Pregnant. For The Past 2

Hi.. I am 12 weeks pregnant. For the past 2 weeks I feel a slight pain/sensation somewhere around my pelvic area when I sit down at chair. It feels like something pushes up when I sit after standing. I have got urine test done and it was all ok. This is my second pregnancy, I never experienced anything like this with my first one so I am bit scared.