I had a chemical pregnancy recently... I tested on the 26th of February, and then later that day my period came. Heavy and clots, for 5

Days (normal) my period was actually 3 days early but that’s normal for it to be a little early/late. However.. I’m 10 days past my period and still getting faint positives! They aren’t getting darker and they’re not getting lighter! I’m so confused. If it was a chemical how is the hcg still in my system?!