What's going on?

I went to the emergency room in January, they said I was having a miscarriage, I went and got blood drawn again 2 days later to check my levels, I never heard back, so I just assumed it was a miscarriage as the ER had said. 
My SO and I knew we wanted to try again and the end of February I hadn't started my period, I took a test and it was positive, last week I called my doctors and told them I thought I was pregnant, the doctor ordered for me to get blood work, well Monday I got my results, she said my levels show I was 2-3 months along. 
My SO was a twin at birth and he also has twin siblings. Is it possible I never actually lost the baby? Or could I be having twins? Or could I have been pregnant with twins and lost one? 
My appointment isn't until March 31st so I am just trying to figure it out 😁 I'm so confused

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