Late period/negative test results

Alexandra
Hello-I am now 5 days late.  I have never missed a period and I have taken 3 pregnancy tests, all are negative.  Anyone ever experience this before?  I have symptoms of extremely sore breasts, very tired and light cramping.  We have been trying to conceive for 5 months now so I am
Hoping for a postive test. Anyone have a simliar story?  Any insight would be great!