This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ectopic Pregnancy (Hello ! Where are you ?), Subject name: Gynaecology & Obstetrics
Plasma levels of hCG during pregnancy doubles every: 
Select and explain. 
A. Daily, B. 2 days, C. 4 days, D. 6 days
B: 2 days
Answer: B: 2 days 
Explanation: In normal pregnancy it doubles in every 48 hrs In ectopic pregnancy it doubles in every 5 to 7 days These occurs only until 7 weeks of gestation.