I'm A Day Late Whats Wrong!!?

ok so i had in august and i took a blood and took 2 one pregnancy tests even though i hate one step and they all cam out negative but im having nausea, cramps, eating more than usual and my look bigger and last month my period came on the 16th and i thought she was coming yesterday but she didnt so i am a day late and everyone is like ohhh blood tests are accurate and crap and its like ugg im tired of hearing that. and my stomach feels harder also.. should i get a first response??