hello doctor i did an Ultrasound and here is the result : USS SHOWS BULKY UTERUS WITH A SINGLE GESTATIONAL SAC WITH FETAL POLE WITH EQUIVOCAL CARDIAC PULSATION AND CRL6.4CM IN THE MID CAVITY. LIQUOR VOLUME IS ADEQUATE, INTERNAL OS IS CLOSED, BOTH ADNEXA APPEAR FREE, POUCH OF DOUGLAS IS EMPTY. NO FREE PELVIC COLLECTION SIGHTED, NO CYST, NO FIBROID. Please what is the meaning