Question

I had unprotected sex 6 days ago and took the morning after pill but i read it does not work for ppl who have a BMI of 35 and higher. I am in that categorie. I have been feeling very nauseous and notice that my belly button it is hard and tender. I went to the doctor but still have to wait a week for the results but i have taken pregnancy test and have come out negative. Is it too early to test && are these signs of pregnancy?