Miscarriage or blood clot?

Andrea

So I hadn’t had my period in maybe 2 months. So when I started cramping horrible and I felt wet, I thought “Yay my period” and there was blood, but there was also this. Is it a blood clot or could it possibly be an embryo.. It was the only time I bled in the entire day and week. Can someone please get back to me? Thank you.