Missed period am I pregnant?

St

I’m 21 days late, but I’ve been late before like 3 times on the pass & wasn’t pregnant. (Due to stress, etc) my periods are VERY regular & have been for years now. All pregnancy test are negative tho. Ive been very sleepy lately & hungry randomly after I just ate (im usually always hungry so this doesn’t count lol) and itchy & tender breast... Am I pregnant? Has anyone ever missed a period before in the pass just because?? How did u feel when you found out You were pregnant?what were you symptoms if you had any?