just received results of a US transvaginal: FINDINGS: Anteverted normal appearing uterus which measures 9.9 cm in length. There is fluid distending the endometrial canal. The double wall endometrial thickness excluding the fluid is 6 mm. No myometrial masses are seen. The bilateral ovaries are normal in size and appearance with bilateral Doppler flow to the bilateral ovaries. IMPRESSION: Fluid-filled endometrial cavity. Otherwise unremarkable exam what does this mean?