pregnant ?

My LMP was on 3/26 in 4/28 my doctor say im pregnant but between 4/27 to 5/11 i was bleeding but light red with lot of clots with no pain or cramps the bleeding was not heavy just when i wipe so i go to my app for ultrasound 5/27 to check when is my due date and the doctor say she just saw my uterus lines and the hcg result that she take on 5/27 was also negative so i lost the baby when i have those clots ? Im confusing cause i dont have heavy bleeding with cramps and i dont see my may menstrual period and i have sore breast , bloat ,heart burn ,some nasty flavour in my mouth , little cramp on my sides of belly and brown and light red discharge i have this symptoms for a week i do a hpt yesterday but comes negative maybe is to early ? or is that my period comes soon ?