16w5d don't feel pregnant anymore :(

I had my 16w midwife appointment on Wednesday and heard a strong heartbeat but apart from hearing that I just do not feel pregnant at all. My appetite has completely returned to normal, I'm less tired, my bump doesn't seem to have grown at all. I wake up in the morning and there's barely anything there at all. Ive stopped feeling any pulling or stretching pains too. Driving myself insane worrying about my baby!! Even my boobs don't seem to hurt anymore. I constantly poke and prod them to try and feel something!!