Please help I haven’t had my period

I got my period on the 18th of November it ended the 21st. December is almost gone and I’ve gotten nothing. I’ve been having slight cramps on both sides of my lower abdomen that go back and forth between sides and sometimes it’s directly in the middle. I have little to no clear watery discharge. My breasts are SLIGHTLY tender, Areolas a tad darker but usually that happens before my period, no fatigue, no frequent urination, no cravings, I don’t really have an appetite, no nausea, slight back pain which also happens before my period. I’ve had some stress going on but I wouldn’t think it would be bad enough to effect my period