Its possible but its also possible that you still feel pregnant because u still have hormones and a baby inside u. Or ur tricking yourself mama but the only person who can tell is your doctor. Have them monitor your hcg levels for a few weeks and that will tell you. Have they told you the baby isn't alive? If so have they monitored your levels? And you can always get a second or even third opinion good luck!!!
Symptoms don't mean or tell anything. For as long as you have the hCG hormone in your body you will "feel" pregnancy regardless of viability. This is why we stress so much to not look too much into how you feel, because it doesn't tell anything. How far along are you, and what are the doctors saying?