23 days late, negative test...

My period is now 23 days late! My cycle is not normally irregular and since I am trying to conceive, I took a test and it didn't show anything at all! So I took another one the next day and it was negative. I'Ve been nauseous (not vomiting though), emotional as hell!!!, cramps, headaches, super frisky, and urinating every hour! I'm so confused and annoyed! 23 days late is ridiculous. 
I am not stressed but I am annoyed that I don't know what's happening. 
Is it still possible to be pregnant or do you think something else is going on? :/