Need advice on preg tests

My last period was Feb 18 and I’m now 5 days late on my period this month and I’m always on time each month. I was supposed to get it Monday so I took a test Monday and Tuesday and they both came back negative. My nurse friend told me to wait til I’m one whole week late to take another. I don’t have any symptoms but we’ve been trying to have a baby the past 4 months and I’ve taken my prenatals everyday and we have sex often especially around my ovulation. Idk what this means...