After an abortion
return to the normal menstrual cycle usually takes a couple of months. You seem to be going through a phase of hormonal
disturbance consequent up on your abortion. The beta-hCG
levels are insignificant and they are not conclusive of a pregnancy; a doubling titre associated with a positive sonogram helps in the diagnosis of an early suspicious pregnancy. You should consult your doctor for a follow up and exclude an early or chemical pregnancy or a missed pregnancy. Wish you good health.