"i was recommended the mirena or errin because they were non hormonal 2 yrs ago. i chose the mirena and hated it. i decided to end it with that got pregnant with my 2nd child decided to get on another non hormonal because i&#039;m breastfeeding. this time i chose errin and love it the first 2 months i would get 2 periods instead of 1 it is the same length (3-4 days) and flow since i was younger. as of this month (july) i have not had a period."