Late but no BFP

I was suppose to get AF on the 26th but she did not visit. I have taken a couple test; one was a faint positive and the other was a negative. I am usually every 28 days so it is weird that I am late.  My Breast are very tender, more so than normal. I have also been feeling weird and having moments of dizziness or sickness (but I know I am not going to throw up). I am also getting hungry more and a couple times feel fatigue/shaky if I need to eat. 
The patience gene didn't really get passed my way and I am dying over here. My mom told me I should wait two weeks from my missed period to go to the doctors. I know everyone is different and it might take longer to be able to read hCG levels for some. How long would you guys wait?