There are multiple reasons for early pregnancy bleeding like previous history of pcos or assisted reproduction.
Need in detail history and scan reports to comment about that
As you are already on progesterone supplements donot worry.
No other medication is needed to stop bleeding
Also heavy bleeding can cause early pregnancy miscarriage.
Scan and seeing heart beat is the only option
Yes it can affect growth as well. Serial growth scans are advised later on for monitoring
Health Tips
Take small frequent meals every 2-3hrly
Drink plenty of water
Avoid outside and spicy food
Avoid lifting heavy weights and sexual intercourse as there is risk of miscarriage
Avoid raw papaya, pineapple and any allergic foods
Dry rusks and ginger in the morning can reduce nausea and vomiting