what's this? 7 wks pregnant

So hey ladies! I'm so excited to be pregnant!! Everything's been going well! Today after I peed, I wiped & noticed this !! (In picture down below)! I always have a brown discharge everyday ! It's not bad enough to where I need a pad but I wear a panty liner! & sometimes I wipe there's no discharge but I do have the brown discharge daily! So I wiped today & took a pic of what I saw! Lol what the heck is this stuff?! I'm not really worried that anything is wrong as the doctor & friends have told me about having discharge throughout the pregnancy! But I'm curious! Have u ladies had this? Or know what it is?! Thanks!