Can Bleeding With A Large Clot Discharge Be Due To Miscarriage?

Hi,I am 30 yrs old.my last period was started on 30th April & after that i just started bleeding since yesterday evening.I have done two urine test at home & one at clinic since my due date.in all cases I got very faint positive line.Today i have seen a bib\g blood clot about 2inch size in curve shape.i am not having much pain.But I am afraid.Is it a miscarriage?