Thanks for writing to us.
Since there is a collapsed sac seen on an ultrasound
scan in the uterus
, it seems that you had a chemical pregnancy
or a blighted ovum
which has caused the positive test. It is now best to wait and let the bleeding start spontaneously.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Rakhi-Tayal