I had an abortion on jan 10/2015, after 6 weeks i had my normal period, from then my cycle was not so strict it varied from 30 -40 days. i'm worried.

Every 30-40 days: ...is "regular" by most physicians' standards. Assuming you didn't have an immediate complications from the abortion (infection, heavy bleeding, incomplete abortion) then you should be just fine. This is a good time for you to exam the method(s) you use to prevent pregnancy so you can avoid another unplanned pregnancy and protect your future ability to have a planned one!