Keep it clean with salt water and take mild pain killers. You have now got a wound in your ear with a foreign body in it. If it looks like there is an infection in it then see your doctor for some antibiotics or remove thd piercing.
using plastic when stretching your ears, cleaning them everyday with dettol or baby oil and/or stretching up one size at a time will all help against getting a blowout or infection.
also, if your going for bigger sizes, at anything bigger than 8mm, you can use silicone tunnels to stretch, which are a lot less painfull in my opinion.
hope this helpedWhat ear is the straight ear to pierce?