Bled 14 weeks after abortion, one year ago. Random bad pains since, untreated., could it leave long term complications/risks? If so, what can they be?

Possibly. If you had a postop infection that was not treated, it could lead to scarring that can cause pelvic pain or problems with fertility. See a doctor for possible infection but you won't likely get checked for fertility issues unless you're unsuccessful getting pregnant.
Unlikely. Symptoms are non-specific (e.g. May be due to many things). If your symptoms are persistent, follow up with ob/gyn.
Unlikely. The bleeding while abnormal could have been abortion related which would have resulted in a d&c. Which it appears you didn't have. It may also have been due to your contraception. An ultrasound and exam would be helpful.