TTC after 1st AF from M/C

I found out I was pregnant days before Christmas last year. We were all so happy. Best Christmas gift! But January came. I had a miscarriage January 12,2019. Our baby angel was just 6 weeks. Doctor said we can TTC after 1st AF that will come around 4-6 weeks from the time I miscarried. At exactly after 4 weeks AF came. I am usually 28 day cycle. So my husband and I baby danced everyday during our fertile window. Now I’m currently 13 or 14 dpo but still BFN :( I started to test from 8dpo all BFN. I still feel pregnant though. My boobs are sore, I’ve been having mild cramps especially on my left side, backache, and dizzy. But now that I’ve been having BFNs I’m losing my hopes ☹️