Second m/c at 6 weeks 😔

I am extremely sad to say we lost our second pregnancy this week. 
We were just passing the 6 weeks mark when I started spotting brown discharge. The doctor's office told me it was nothing and to only call back if I started bleeding heavily. 
Two days of brown spotting and then it turned bright red. Still spotting so trying not to worry, but after losing our first angel at 14 weeks of pregnancy last year, I just didn't wanna take any chances.
My husband took me to the ER and after long hours, blood tests and u/s, they told me we can't see anything, but it's too early to see, you might be fine....
As soon as I left the hospital, my bleeding started getting heavier and I just knew it was over. Then the worst cramping of my life started.... I have followed up with the doctor since and my hcg levels are almost back to not pregnant already :/
It is very different for me this time around, as I never got to see the little angel. I don't feel I had the same attachment. My sadness is not so much a grief, but more a big question mark on why this is happening to us. Last year's experience was devastating and almost tore our marriage apart. I am most heartbroken for my husband who is going through this, yet no one really aknowledges his loss. He is trying so hard to be strong for me but I worry for him. 
We are planned to do chromosome testing for the both of us, to make sure this is not the issue. 
My doctor also plans on putting me on progesterone next time I get pregnant. 
Really no one is able to tell me what went wrong either times. 
I know we'll be ok, because we love each other so much. I just never thought it would be so hard for us to become parents...