Miscarrying :(

x0
I'm 5 weeks and 4 days today, I know I'm miscarrying. I started to have brown blood last night around 8pm, I then took a test and it was a faint positive compared to my blazing positives I had last week. I didn't have anymore bleeding throughout the night just cramps off and on. Currently, I am bleeding red. It's light right now, I passed somewhat of a clot but I know it's not over yet. 
Do I have to go to the ER? I would rather miscarry in the comfort of my own home. Hubby is not even home and he is at work and can't leave, he gets off at 10 tonight and it's only 2. No one knew I was pregnant, and I want to keep it that way. 
My only concern is I need the rhogam shot because I am a negative blood type. We don't know what hubby is. Since you need the shot 72 hours after miscarrying or giving birth, could I call my doctor on Monday to go in and have them check me out then give me the injection? 
I'm so heartbroken.