Please help! I need advice!!

Court

Okay so my period is about 3 days late. My period has NEVER been late and if it was it was only by a day or occasionally it’s early by one day. For the last two days I have been having very mild cramping but it doesn’t really feel normal or what I’m used to when I’m on my period. I took a test yesterday that was negative. If I don’t get my period soon how long should I wait to test again?