Sad and confused

Em

So I’ve been ttc for a few months now, last month I found out I had a miscarriage and left me just miserable. And yesterday and today I took 3 at home tests, all came back with a faint positive so I decided to call the doctor and have a blood test. At this point my period is 6 days late and my boobs are SOOO tender and painful... They called and said my levels are to low and to go back in 2 days and test again. It has my head spinning in circles. Anyone have any thoughts or support?