Brown discharge while on skyla

So I'm on Skyla, and have been on it since July 5th..its July 17th today. I have brown discharge coming out, don't know if it's considered old blood..but it's enough to wear a pad...maybe just a panty liner, but for sure gotta have something on! Is this normal? Along with it I have some mild cramping nothing a couple ibuprofen cannot take away. Anybody else experience this before? First type of birth control ever, and besides that it's been awesome! I just feel that it's getting in my way and can be a bit annoying to have coming out. I feel yucky! I've read it's normal, but I'm curious about anybody else's experience and how long it lasted. I'm on day 3 of this and I feel fed up with it already..🙄