I don’t know what to do need answer

PrettyqueenMimi

I’m 21 years old & I went in got a ultrasound done to check make sure everything good no I’m not pregnant well not that I know of doctors found a sac with a cystic structure in it behind my uterus & concern that I may be pregnant I took plenty pregnancy tests all negative I’m just worried dont knowwhatsgoin on 😢 Anyone else going through some similar