I had pregnancy like symptoms and than this happened: abdomen & back pain worsens passing fluids , large blood clots dont feel thos symptoms anymore. could this mean miscarriage?

Possibly: Pregnancy symptoms include tender, swollen breasts. Nausea with or without vomiting. Increased urination. Fatigue. If you had these and then began bleeding and cramping, it is possible that you had a miscarriage. It is important that you see a Dr to determine that there are no complications or other findings that point to a different cause.