Not sure what it could be someone help !!

Marina
About a week ago I was cramping a little on my left side , 3 days ago I used the bathroom  in the morning & I passed this big blood clot & then later on the day this string of clear/blood thing , & then it just stopped , I don't know what it was but I took a test lastnight & I didn't see anything but this morning I look at it & see this , picture is below