Late period negative test

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So my period is late by four days but have taken three tests and they are all negative. Sometimes my period is late by a week, it happens about once or twice a year. However, this time I have all the symptoms for pregnancy. I wasn't worried and I was going to wait it out, however since yesterday I have been constantly cramping and peeing so much.. I just took the third test and its still negative. I'm scared of aN ectopic pregnancy... What are y'alls experiences?