Passing blood clots is not the same as implantation bleeding in early pregnancy. This article describes how blood looks and lists bleeding causes.
The Truth About Traveling Blood Clots
13 Causes Of Blood Clots In Placenta During Pregnancy
11 Heavy Implantation Bleeding Stories (You're Not Alone)
Pic included tiny blood clot passed?
Passing clots early pregnancy
Why Bleeding During Pregnancy Doesn't Always Mean Miscarriage
Bleeding and blood clots
Menstrual Clots- Know what's normal and what's not
Blood Clots in Pregnancy: Reasons, Signs & Treatment
Implantation Bleeding vs. Miscarriage: How to Tell the Difference