Yes call ask they will treat you for mastitis but for some reason my doctor didn't treat me when I got it if it's mastitis you can google the signs of it when I had it my breast were super rock hard with red lines cracked and bloody nipples I had 102 fever

Have you checked your temp too? To see if there's an infection?It could be u adjusting but mastitis will do it too lik @ab mentioned. They'll probably give you anribiotics

Do I have to get treated for that

How are your breast right now? I remember I got a fever and chills after I had my son I had mastitis but maybe it's your body just adjusting after giving birth