Thanks for your query,
Yes it might me be positive from your earlier pregnancy
.How long it takes for the HCG
levels to become normal depends on at what point in the pregnancy you had the termination and also the method adopted. Most women can expect their levels to return to a non-pregnant range about 4 - 6 weeks after a abortion
Usually chances of fertility
is very high immediately following an abortion.
If you are really concerned, you can go for serum bhcg test to see exact levels and its rise after 48 hours. Also you can go for a TVS scan .
Best of luck,
Hope it helps..