Girls, hello. Pregnancy is 12 weeks, almost 3 days present irregular,…

Girls, hello. Pregnancy is 12 weeks, almost 3 days present irregular, but at the same time prolonged pulling pains in the lower abdomen, slightly radiating into the waist. I had a screening, pregnancy progresses, but they put a threat. There are no discharge, nausea, pain in the chest is there. I'm taking Utrozhestan and morning and evening. Should I be afraid? Has anyone experienced this?