Thoughts and prayers appreciated

Sarai • A mother of two amazing children. Miscarried at 20 weeks with miss Avonlea. Our heavenly angel
I have mentioned on here before I have placenta previa. 
I went for my twenty weeks ultra sound and the heartbeat wasn't there. 
The baby wasn't moving. 
So heading to a specialist to have more tests done and a c section since my placenta is still low. 
I have never been through this before. I've had two previous miscarriages at 6 weeks. But this is new. 
Anyone else have this? And lost a baby this early? I'm not sure how to act or feel or even do when it is born. 
Thank you for reading this :-)