Hashimoto's/ hypothyroid and pregnancy?

My SO and I are no where near TTC yet but it is in our 5 year plan. I know it can make things difficult and its one of my biggest fears to not be able to conceive when the time is right. 
 Have any of you ladies had a successful pregnancy with Hashimotos or hypothyroidism? Were you on birth control before TTC? How long were you TTC and did you have any miscarriages? How did your endo and obgyn monitor your levels during the pregnancy. 
Thank you so much for any info you can give :)