Miscarriage or clots?

I had a miscarriage two years ago and we have been trying for another baby since this past September. I am taking vaginal progesterone bc I have low levels and clomid bc I do not ovulate. I recently was 8 days late but a pregnancy test was negative, I then got what I though was my monthly and a day later a slimy clearing white veiny clot covered in blood came out in two pieces. I am worried I may have miscarried bc they look similar to the last miscarriage I had and not like any other clots I have ever had. I would post a picture but I'm not sure if something graphic is allowed. Input please!?