<s>[INST] Had nexplanon 2/3/12 fine for first 6 months. periods went to every 25 days then every 6 days, heavy bleeding between periods also. Now have missed my period and havent had one since 30/10/12. I feel nauseaus exhausted, breasts feel heavy and sore, increased urination and pain on left side of pelvis and abdomen. Could the implant failed? [/INST] HIThank for asking to HCM I really appreciate your concern the history that you gave here may not be due to the IUD, but this could be due to the hormonal imbalance, even if you have some doubt then there is only option to clear the doubt is clinical examination it is better to check it out the right position of IUD, but the chances of this is very minimal, hope this information helps you, have nice day. </s>