Thanks for the query.
The blood in the ultrasound
could be subchorionic hemorrhage.
Usually minimal bleeding can subside soon.
If you are using the cyclogest
vaginally, you can shift to oral as vaginal insertion probably causing spotting.
Usually natural progesterone
will not cause much side effects.
If you are getting the pains frequently, once consult gynecologist get examined and go for coagulation profile once.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429