I'm so confused!!!

I'm 17 days late (my periods are sometimes irregular but I always know about when I should start), I'm not feeling well (not morning sickness just generally not feeling well) I'm exhausted, I have no appetite, I'm emotional, my breasts feel swollen and tender. I have endometriosis and usually have severe cramping leading up to periods and I have had zero cramps. Yet... I've taken 3 home tests and they're all negative?! I have 2 children and have had 1 miscarriage. I've never had an issue with HCG levels/false negatives but is it possible it's really low now? I'm not sure what my next step should be... Wait it out or go to the dr? Anyone have any experience or advice?