A 22-year-old woman in early pregnancy (7 weeks by dates) presents with painless vaginal spotting. She is haemodynamically stable with no abdominal tenderness. Serum beta-hCG is 900 IU/L and transvaginal ultrasound does not visualise an intrauterine or ectopic pregnancy. According to guidelines on early pregnancy bleeding, how should this situation be described and managed initially?