Why do i feel like this? somebody help?

I'm 17 weeks 18 weeks next tue but lately i feel like my bump is going down i now this might sound stupid but i don't feel pregnant anymore for some reason? i was at the hospital last week for light bleeding but doctor done a scan and everything was ok baby was moving and all the doctor said that can happen to a pregnant woman sometimes that she can bleed lightly ... just wondering if anyone ever felt like this before that ur bump is disappearing?