Am I pregnant? My period was light,short,and late

Patient: My period was 3 days late so I took a pregancy test the first day I was late and got a negative test. My period lasted for 3 days and I used 3 tampons with a small amount of blood on each and bled through 1 tampon. I’m on birthcontrol and my period is always 5 days not three. I did take antibiotics for ten days.

Symptoms: Vomiting,mild cramping,constipation,fatigue

Doctor: