Welcome to Healthcare magic.
test if done from a reliable lab & is negative almost rules out the possibility of being pregnant.
As far as the fetal ring is concerned it may just represent a thick endometrium. I suggest you to have one transvaginal ultrasound
for better resolution.
None of the symptoms you quoted are specific of pregnancy.
But If you are overdue for your periods you should repeat pregnancy test after one week as in that case we cannot comment on what will happen in future.
God bless you.