Negative tests but morning sickness?

I did a urine test at the doctor yesterday and it was negative but I just woke up at 1 am feeling sick until I finally threw up at almost three... I feel better a little sick but better and I don't have fever... I'm supposed to get my period any time from yesterday til tomorrow... My breasts are sore, nipples are darker, and veins are more obvious. Anyone had these symptoms and were pregnant after a negative test? I'm 14 dpo today! Bfn from 9-13 dpo so far