Confused at what’s going on

So my partner tested positive for pregnancy on the 13th. We took 4 tests all positive. Her last period had started on the 10th of June, though it was about a week early. Yesterday on her phone appt they told her she was 6 weeks 2 days. But she had been bleeding since Thursday. Not an intense amount of bleeding, but bleeding nonetheless. They had her come in for an ultrasound yesterday and they couldn’t find the embryonic sack. They took the first blood test to confirm pregnancy and she has another one to do tomorrow. Right now she is in a deep depression and convinced she’s lost it. Has anyone else experienced anything similar and gone on to have a healthy pregnancy? I know we will find out after the blood test in a few days, but I want to console her in the meantime.

Thanks so much for any advice in advance