Late period, Negative Pregnancy tests

I am 32 days late for my period, I've taken 2 pregnancy tests and they both have came back negative and I went to the doctor and they gave me a pee test and it was negative also. I don't know what's wrong with me, I'm not more stressed than usually, but I have gained some weight. I've always had a period a month even though the cycles aren't always the same amount of days. The only pregnancy symptoms I've experienced was dizziness. I've had mild cramps and acne so I kept thinking my period was coming but nothing. Any ideas of what is going on with me?