I got a medical abortion may 16 and my period is still not on .. and i had unprotected sex 3 times after the abortion. what could this mean ?

Means it's time to: It's time to do a pregnancy test, because women can get pregnant when they have sex, and they ovulate BEFORE a period (which is why women can get pregnant after delivering a baby, before their first period after having a baby). A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred).