Currently, my period is 5 days late, but the test shows 2 lines, each day getting darker. On April 29, after 5 days late, I had a transvaginal ultrasound and the doctor concluded that the uterine cavity has an anechoic nodule with an increased echo around it, 4.5mm x 2.4mm. Doctor, can you tell me what it means when my period is late and the ultrasound shows an anechoic nodule in the uterine cavity? Am I pregnant? Is that anechoic nodule considered a gestational sac?