If the uterus is removed, as in a hysterectomy with preservation of ovaries, they usually work normally until natural menopause. But this may differ from person to person and the surgical approach. You should talk to your gynecologist and with the surgeon that did your surgery for details about you case. They will inform patients about post-surgery ovarian function recovery.

The "risk for fetal aneuploidy is low" means that the probability of the fetus having an abnormal number of chromosomes is considered to be low which is a positive indication.

Having blood type O negative when pregnant can lead to some complications. If a person with this blood type gets pregnant, the mother's body may produce antibodies that can attack the baby's red blood cells. The baby may have symptoms like jaundice or anemia. Doctors can give a medication called Rh immunoglobulin to the mother during pregnancy to prevent this. 

If a person has symptoms such as tiredness, nausea, and breast tenderness because they missed a period then she can be pregnant and this would mean that the egg has attached itself to the lining of her womb. One should confirm this by testing using their early morning urine sample since it is more concentrated thus likely giving correct results.