Hello. Welcome to hcm.
Repeated ectopics may be due to various reasons and most commonly due to infection in fallopian tube
. Infection after abortion
treatment is highly unlikely as you would have had all features of PID and you would have got it treated.
I advice you to undergo tests from regular blood tests to specific tests like thyroid function tests
. Mostly the cause is not known and once ectopic occurs,there is a high chance that it recurs.
All the best