Hello, Serum beta-hCG titres remain positive for 3-4 weeks after an abortion. The titres gradually fall and positive levels can sometimes be seen until 6 weeks. This fall depends on the initial hCG titres also. Abstinence is usually advised for 1-2 weeks after any minor procedure on the pelvic region. After an abortion, contraception is advised for at least 2 months and hence sexual intercourse should be protected meanwhile. Return of ovulation does not happen sooner than two weeks after an abortion in the usual situation and hence, you need not worry about another pregnancy. Hope this helps.