I have had negative at home and a blood test. I am a week late now. Just at 5 days late after my blood test, my doctor is saying that my antibiotics could be affecting my AF. Last month I was only 5 days late, but it came. Now, I'm just confused. I did have nausea, dizziness, headaches, bloating, back pain and acid reflux. But, I'm just confused why my AF still has yet to come. I was told to wait two more cycles before coming in again unless I have abdominal pain, etc. Any help??? Anyone gone through this. I'm always regular.