Oh I looked at both of these! I ended up with the Implanon...

which is a small rod which is inserted under the skin in your arm. It's done with a local and over with very quickly.

Pro's and cons are the same as most contraceptions... some women bleed for months some go without their period...

cost me nothing as I had it done in the hospital before I was discharged.

I've only had it in 3weeks 1 day, so can't comment on the rest of your questions...

I also looked at the mirena, but decided against it...
I didn't like the fact it was quite invasive and you had to check on it at least once a month to make sure it hasnt moved.
Another thing was I had to wait until min 6-8 post partum and I wanted something then and there so I didn't have to worry about it!

I've read that with the mirena you have to get it inserted within the first few days of your cycle... which really grossed me out