Hello! Had two ultrasounds recently. First showed a corpus luteum cyst on ovary, thickened uterus 11mm, somewhat bulky, anteverted uterus, but no period for six + weeks. Extremely sore nipples for a number of weeks. Nausea, vomiting. Doctor wanted another ultrasound, so went two weeks later. Two weeks later, Ultrasound showed cyst as dissapating and a fluid sac in uterus. Still no period. Could I have been pregnant and it did not take? Sac does not match appropriate dates. Why no period, still?