Hello! From the very beginning of pregnancy, there's a pulling sensati…

Hello! From the very beginning of pregnancy, there's a pulling sensation in my lower abdomen. It feels like it's at the same point. Mostly barely noticeable during the day, but more noticeable in the evening and at night. I had an examination with two different gynecologists (the first for confirmation of pregnancy, the second yesterday as part of registration) both said there was nothing serious, but I only told the first one about the pulling sensations, the second forgot to mention them. When should I start panicking?