Is 4dp5dfet too early?


Hello all..I had my fet on 9/ is 4dpt..I took a hpt..well 3 and they were all bfn’ last fet I tested on 4.5 days past and had a faint positive and that ended in miscarriage from developmental problems..I am so scared..this was our last frozen embryo and I am really really scared..I know all pregnancies are different but usually by this time I have some sort of line...any advice?