Weird discharge

Hii I need help I’m having brown discharge with like really mild cramps I need help wondering what it is I don’t really want to be pregnant because I took a plan b pill like a day after having sex that was I think last week or two so I’m just wondering if my body is being weird because it’s in the fertile stage or I’m actually pregnant not that being pregnant is bad but I’m 20 and I’m not even dating the guy I’m sorry I’m ranting but please help!!

Update it was gone when I got done ovulating I also took a pregnancy test and it was negative