When to worry about bleeding during pregnancy

Has anyone experienced a lot of bleeding during their first trimester of pregnancy and still went on to deliver a healthy baby. I’m about six week but have been experiencing random spurs of bleeding like not heavy but it’ll last for like 2 or 3 days then go away. Every time I go to the doctor they check my blood and they always say my hcg is still rising and To just rest. But this has occurs three times already and I’m only 6 weeks.. I’m scared something might be wrong