2nd chemical pregnancy

My first test ever BFP was in April of this year.. I ended up having a chemical pregnancy at 5.5 weeks.  I was devastated.  The doctor told me it was normal and happens to most women, but because I was counting days and testing I knew I was pregnant, where the "other" women would've chalked it up as a late period.  I held on to hope that I could get pregnant and that the next one would be perfect! I got my second BFP last week.. 16 DPO and 2 days before AF.  I continued to test for peace of mind.. But the lines weren't getting darker. I called my doctor and had some blood work done. My first hcg test 21 DPO was forty and my second 23 DPO was 16 :( I got the phone call today.  
I just feel so broken.  I feel like I'm killing my babies.  We've been trying so hard and I thought this time was it! My symptoms were completely different and no spotting this time.  So now I'm just waiting for my period to start.  Is there anyone out there who has had multiple loses or chemicals and have had help.. Or figured out what was wrong? I have an appt on 9/7.  I was reading about progesterone and want to have that checked out asap.  It a horrible feeling knowing its me.. But not knowing what's wrong!  I need some hope or positive vibes.. Please