Help me please! Has anybody ever had this happen to them?

Ok so 4/28 I had a miscarriage at 6 weeks. Levels weren't even that high. 2 days later they were at 11 then at 0. On 5/30 I got my faint bfp. Started testing everyday and line just kept getting darker and darker. Symptoms I was having were gassy, frequent urine, huge appetite and backache. Went to get an ultrasound at 6 wks and baby was perfect heart was beating at 100 bpm. Doc said that baby's heart rate would rise in the next week or so. Symptoms went from that to nausea, vomiting, dizziness, no appetite and just really bad fatigue. These past few days I haven't really had any symptoms just today frequent urination and these past days fatigue, a little bit of dizziness and a some what appetite. I'm really nervous that I may have miscarried and that I haven't passed it. I haven't bled and very very light cramps. I have an appt on the 29th I'll be 8 weeks to check on baby but I'm still very nervous. I took a pregnancy test cause it was killing me and it's still dark but just not that dark. Has anybody had this happen to them and baby was still fine ? I can't lose another baby :(