After IUD ?

Hey guys ! I’m so annoyed. I went into my 6 week check up on Monday and the doctor offered birth control. Of course I was already thinking of it since I wanna be able to be having sex freely. I was debating between Mirena or copper IUD. (Nexplanon is out due to bad experience) anyway !

The doctor said I was going feel slight cramping while she inserted it and i was to bleed for the remainder of the day. WRONG. I’ve been bleeding ever since. I don’t know if it’s my period but the cramps have been pretty painful and prolonged. They hurt. I’m annoyed. The bleeding is not as heavy as a regular period but It’s there. Someone help. Is this normal ?? I’m about to go in and get it taken out 😫