Bleeding EVERYTIME after sex??

Hello, I am 20 years old and have had 4 sexual partners. I noticed that every time I have sex that I have bled and continue to have bled for 1 day after. Is this normal??? I experience no symptoms of pain or anything during or after it’s just the blood. For background, I do have an IUD, a lot of the times there’s little to no foreplay (recent sex partner there was but still bled), and lastly I tend to go long periods of time with no sex (months). I’m thinking about consulting a doctor because it freaks out my current partner.