Took prometrium (micronized progesterone) for thick lining biopsy normal this cycle i had two blood clots the size of quarters is this normal after sitting 3 hours?

Normal: If your lining was thick then there was extra tissue inside the uterus. And the biopsy is to rule out cancer. But a polyp can also cause a thick lining. The Prometrium (micronized progesterone) is to thin the lining so often that leads to a heavier period with clots. But if all that continues you may need a saline ultrasound or a hysteroscopy to evaluate further. An office biopsy is not nearly as accurate.