I was 4 weeks pregnant and I went for gym and...

What is the treatment for bleeding during pregnancy

Blood bleeding in the second month of pregnancy This means that pregnancy may be threatened by bleeding so need for  pregnancy fix like OVAPROST SUPP 400 MG can be taken once a day for a week or ten days and Using Duphaston to stabilize pregnancy
In the event that the bleeding continues and there is no fetal heart ,so you can wait until the termination within a week or  surgical solution to make D&C 

How is the diagnosis made

It is through a full clinical examination and also a vaginal ultrasound examination to check the fetal heart and the pregnancy sac

What are the causes of blood in first trimester of pregnancy

• Threatened abortion
• Ectopic pregnancy
•  molar pregnancy
• Abortion of all types 
• Vaginal infections

Advice

 follow-up with the obstetrician-gynecologist for a medical examination and evaluation