I am going to miscarry....I am not prepared for this

Iulia
I have a healthy 4yo and yesterday I found out officially that I am going to loose this baby who should be 7w3d by now. 
My beta HCG is on the low side, and the numbers just stalled going from 3100 to almost 3200 in 48 hours. 
The ultrasound last week didn't show a heartbeat cause the fetal pole was measuring only 1mm (too small for my LMP)
My heart just broke and I feel somehow numb waiting for the miscarriage to happen. My symptoms which were so mild this time are also fading. 
I don't know what to do, it just never crossed my mind that this can happen to me, too. I am scared and feel deeply alone and miserable even if my poor husband tries to support me as best as he knows. 
The feeling of helplessness has surrounded my whole being. I was so prepared to fight for this baby, to give up anything I should've given up, but this just seems to overwhelm me, this seems just so unfair...