Can a ectopic pregnancy beg diagnosed through an hcg serum test, or that would test negative? please help it is urgent?

hCG typically doubles in level every 2 days for the first month of pregnancy. A slower rate could indicate early miscarriage or an ectopic pregnancy. Each facility establishes an hCG level that is adequate enough to order an ultrasound to visualize the gestational sac and location. The severity of symptoms and presentation, hCG level, and ultrasound findings will determine management