a woman considering this because of difficulty with periods should consult her doctor and find out alternatives that diagnose and treat the underlying problem, rather than using a drastic means, with grave side effects, to treat symptoms. this thread will be shut down if we start giving medical advice. Use of any contraceptive is gravely sinful if it is used to contracept. There are other medical reasons contraceptives are medically prescribed, and they can be morally used for that purpose, but most of those reasons can be addressed by better therapies with fewer side effects.
What is important to understand about any chemical or mechanical contraceptive, like the IUD, for someone who is sexually active, is that they can act by prevening implantation of an embryo, as well as acting by preventing fertilization, so in the former case the chemical or device actually is an abortificant.
some recent answers on AAA on this topic
forums.catholic-questions.org/search.php?searchid=2295090