Possible miscarriage

I found out I was pregnant on the 10th of September 5/6 weeks on the 14th I started bleeding so what the hospital and they confirmed I was still pregnant via pee test.. They advised me to do anther test a week later as the hormones could still be in my system I took there advice so a week later I did a home test  and it was negative broke my heart but I still haven't had my period yet  and I have put on weight my boobs are getting bigger and feel pregnant so I took yet another test this morning and sure enough it was negative.. Is it possible I could still be pregnant?  Or am I jus being to hopeful?