 [ Symptoms ] how long after mirena insertion can you have unprotected sex  my last period ended june 3rd i had the mirena iud inserted june 20th and had unprotected sex june 28th i have not had any spotting or cramping with the mirena and i have not started my period could i be pregnant or is the mirena immediately effective [ Disease ] no just forgive yourself for a bit of human weakness and keep up your non smoking efforts