Hey girls, can you tell me something ? My HCG is low, there's no pregn…

Hey girls, can you tell me something ? My HCG is low, there's no pregnancy, I haven't had any spotting for a month, and only one light period, just once. Should I be worried? Could this be related to weaning from breastfeeding? And girls who have used Mirena, non-surgical coil, tell me how it was for you? I'm looking forward to any experience, thank you ?????