Threatened pregnancy.

I woke up today like any other day, believing I was 12 weeks pregnant. I started lightly bleeding and my SO rushed me to the hospital. After hours of absolute hell from not knowing what was going on we were told due to my negative RH blood, my body was trying to go through the process of rejecting our precious little one. I got the rhogam shot (nothing new, I've had them a few times in my life) they told me my cervix were still closed, mucus plug still in tact but that from the ultrasound results i only looked seven weeks and even worse, they could detect the heartbeat. They told me to follow up with my OB tomorrow to check the baby's hormone levels/more blood work/another ultrasound and I was to stay in bed. I'm not really looking for advice and I don't mean that to be rude, just prayers. I'm so numb... I don't want to hold on to hope so I don't have to go through another let down but I also don't want to be let down. This is probably the shittiest feeling ever.........