transvaginal ultrasound or beginning of missed miscarriage?

Liz

Yesterday we went in for our 8 week appointment and found that we have a blighted ovum and development stopped around 5 weeks. Late today I started having brown discharge (I haven't spotted at all so far). Could it be from the several transvaginal ultrasound they did or the beginning of the miscarriage? Any ideas? I am really hoping it's the beginning of the miscarriage to avoid a d&c; in the next couple weeks. Thanks!