hi there, if your pregnancy
test comes as negative even after 2 weeks of gestation then pregnancy is unlikely but you can always get an abdominal or transvaginal ultrasound
done to confirm it.Get your urine examined for routine and microscopy to rule out UTI. If you are having any loose motion
along with the abdominal pain
and gassy feeling then probably you might be having a GI upset and may also need a stool exam to rule out gastroentritis.Do get these tests done and get your mind at peace. Take care.