What are side effects of the IUD?

I started an iud in September 2021 and ever since I’ve started cramping and bleeding really bad and very irregular up to now. Is this normal? I never used to cramp with periods before but was always heavy. I’ve tried other forms of birth control and each I have gotten pregnant. This is my last chance. I’m scared too because with my sisters it had rejected her and pushed out. Could it be signs of an ectopic pregnancy? I’ve also been taking anti depressants too starting the same time, so I’ve gained plenty of weight.