I am 12 days late with negative urine tests

I am never late and have never missed a period before. I took a test on day 4, day 7, and day 12 all have been negatives. I am having cravings for sweets, I had mild cramps yesterday, and smells make me sick. I don’t what to go to the OB to get another negative. I have been TTC child # 1 for 3 years and I have a lot of negatives and it’s just nerve racking. I am just what to know if anybody has went through this too.