Pregnancy tests after miscarriage

I'm pretty sure I miscarried last Wednesday at 5 weeks 3 days. I started bleeding a had a regular 5-day cycle except with very heavy cramps and some clotting. I did a hpt today just out of curiosity, and it looked like this. Is it normal to still have so defined of a line a week later? Especially since it was such an early miscarriage in the first place?