I was while BF Piper and am again now. My OB said that you do need to be more careful about taking it at approximately the same time every day, but as long as you're BF you get some level of protection from that also (especially while your exclusively BF with no solids yet) so you get a little lee-way. I'm terrible at remembering to take pills, so when I'm no longer BF I'll probably get on another BCP (or some other type of birth control). I didn't last time because we TTC right around the same time I stopped BF'ing.
I took it while bf'ing DD. It isn't as effective as regular BCP and I did end up getting pregnant on it. You just have to be really careful to take it at the same time each day. I ended up getting Mirena after I had DS since I knew I wouldn't be getting pregnant with the next 1-2 years.
I decided to get an IUD and went with the Mirena. I'm also still bf. I have had no periods since before I got pg with Ethan. It is great! I had very minor cramping the day I got the IUD, and no issues since. I've had it about 10 months.
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My doctor said that the regular BCP is fine when you're BFing, as long as your supply is established. That's what I took and had no supply issues b/c of it. My big problem was that with all the sleep deprivation and general chaos in my house, I took it late half the time. I know that can be a huge problem with the mini pill - you need to be very precise in order for it to be effective.
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Re: mini pill ?
Photos courtesy of Jen Rose Photography