AF still is not here ?!?!?

Af is still not here and it does not feel like she is coming ! I have some spotting the day of ovulation. But it was supper light. I went to the dr so they can do a blood test and come back negative. I Am reading online that some people can have a false negative on a blood test . I am very confused at this moment! I have no idea what to do!!!! I have been emotional and have been craving spicy food ! And also very dizzy in the morning another thing is after I eat dinner I feel so sick to the point were I do think I am going to throw up , i have never changed the way I eat . I am going to have surgery next week so I need to know what is going on ! I haven’t been stressed out and haven’t changed anything ! Help ....