Hello! The left lower abdomen has been bothering me for two days now. It…

Hello! The left lower abdomen has been bothering me for two days now. It feels like a baby went down there. When I walk, it starts pulling or pushing strongly. I called an ambulance, they examined me and did an ultrasound, they said "practice contractions", this can happen and sent me home. It pulls again slightly after standing up. I can't lie still all the time. Should I go on sick leave? I'm still working