at six weeks showing heart beat of 112 is less as said by your doctor.
She has prescribed neogest injection for avoiding miscarriage
is also correct.
The side effects of injection is less compared to the benefit you get after taking the injection, this is what you say the risk benefit ratio,and in this case benefit is more than the risk.
Don't worry,take complete bed rest
, avoid lifting heavy weight and avoid intercourse for 12 weeks.
If you have any symptoms of spotting or pain in abdomen report to your doctor immediately.
Dr. Rishma Lakhani