Could I still be pregnant?

To say this pregnancy has been complicated would be an understatement. My partner and I had unprotected sex on December 5th 2017. Two days later I started bleeding and it went for about 7-8 days. My periods typicbally last me about 4 days and they have always lasted that way. On January 3 I started bleeding very heavily and it lasted again for around 7-8 days. My doctor said I miscarried judging by what I saw when I went to the bathroom ( talking about that is still very hard for me). The reason I think I'm still pregnant is because twins run on both sides of my family. My stomach is bigger like a baby belly would be my boobs get sore often and I think I experienced my first time with morning sickness on Tuesday. I felt like I had a hangover ( I've only had one bad one my whole life) and I wanted to cry. I got my HGC results back last week and it said 0.05 percent. I WHEN I first found out I got a positive test the other five were negative. I got my thyroid test results in and I was 12 when my level should have been 14. Im am confused because I was never notified that I was flagged ( I checkedb my results online). I've heard a lot in the last week the place I got the HGC test from misdiagnosed people all the time. Had I had known that I wouldn't have gone. My doctor wouldn't do an Ultra Sound or a pelvic exam and that's why I am still wondering if I am. Could this be possible that I am still pregnant? I to my partner I shouldn't be feeling like I'm going to be sick. When I was sick on Tuesday I was craving watermelon like nobody's buisness. Could I still be pregnant or am I in denial?