Mirena IUD

So I went in for my consultation with my doctor and ended up buying the Mirena IUD. With my coverage it cost me $146. I’ve already booked my insertion date for 10 weeks post partum, right now I’m 6 weeks pp. I’ve been looking at reviews about the Mirena and now I’m really

Regretting jumping into this so fast. I don’t think I want it anymore but I’m feeling pressured now since I’ve already bought the device and have scheduled the insertion. I also told my doctor that I was all for it so now I feel like I shouldn’t back out. Any advice would be great?