Is it possible..

So, I may or may not be pregnant for the second time.. I’m having a lot of symptoms pointing to be pregnant, 8 days late on my period, growing and sore boobs, tired, moody, constantly hungry. I have taken 4 pregnancy tests over the last 5 weeks, including this morning, they have all said negative.. When I was pregnant with my first in 2016, I did not find out I was pregnant until I was 12 weeks pregnant, and also had all the same symptoms and numerous tests.. . Is it possible that I am pregnant and the tests just don’t show it right away? Has anybody else experienced “feeling” pregnant with all the signs and the tests don’t show right away??