Hi, thanks for using healthcare magic
If there was no history of unprotected intercourse
in the time period following the ultrasound
, then it is unlikely that your are pregnant.
Though the accuracy of ultrasound can vary according to the technician,it should be able to detect any small changes in the uterus
that would have suggested pregnancy
.. If it did not show any evidence of pregnancy, then it is not likely that you are currently pregnant unless, as stated above, you were intimate after the ultrasound and conceived.
The light bleeding is likely your period.
I hope this helps