Bleeding after sex with Liletta IUD

i have had it since april 24th. i’ve had sex a total of maybe 6 times since i’ve had it inserted. the first time it never bled, everything was normal. The past 4 times here recently my boyfriend came in me, so after we get done there’s a small amount of blood kinda clear, slightly a light brown color. then a slight discomfort that only lasts maybe 20 minutes after. but the bleeding doesn’t last really much longer when i use the bathroom afterwards. i asked my friend that has a Mirena and she said it’s cause he was hitting my wall and it was normal. just try a different position. i’m still kind of worried about it. i’d like to get more opinions, thanks in advance!