Sad depressed and helpless

So I had a miscarriage last year and the pregnancy stopped at 6 weeks when I was suppose to be 9 weeks. Seems like it's on replay all over again . I took a pregnancy test on June 23 and it was positive . My last cycle was March 27. My last ultra doing measured me at 6 weeks and 6 days on Monday with a fetus with a heartbeat of 79. I don't know what is going on . I've been having brown spotting for the last few days and I'm just in a bad state of mind right now . I try to keep the way I feel inside and let everyone think I'm okay and I can handle the worst if it's yet to come but I'm dying inside with pain and hurt. I don't know what I'm not doing right and I'm only 26. 😞😪 I pray every night but is that not enough ....I'm so hurt and confused .