“Period” during early pregnancy .

Has anyone gotten their period around the usual time and then bleed longer than they usually do on their period? I tested positive on a hpt and also tested positive at the Er after I realized my period was longer than it has ever been and became to speculate I was possibly miscarrying and mistaking it as my “period”. What could be going on? This is my test today currently on day 13 of heavy bleeding and clots.