"i have been on errin 3 weeks now. i&#039;m a breastfeeding/pumping mother. i was unlucky and got my first period 5 weeks pp. :( my ob said a mini pill would be best for me. so i got put on errin. i know i haven&#039;t been on it long at all, but i have continued to lose weight while taking this pill so far. (knock on wood) so i&#039;m not to terribly worried about excessive weight gain. my biggest issue with it so far is, like i&#039;ve said, i&#039;ve only been on the pill 3 weeks and i have just started my second period this month. i was on my period when i started it. i stopped for 5 days, i started back for 5 days, i again stopped for 5 days, and i have just started again! if i continue to bleed every few days i will be looking into a diffent bc method."