Girls, my cycle varies between 28–30 days. I'm late now: if I count it…

Girls, my cycle varies between 28–30 days. I'm late now: if I count it as 28 days it's the 5th day of delay, if 30 days then the 3rd day. I bought a test and it showed one line... Is it still too early or can I relax and wait for my period? Symptoms: lower abdomen has been pulling/cramping like for a period for two days but it hasn't come, breasts are sore, fatigue.