hi. try not to worry. i didn't even know i was pregnant untill 12weeks with my first. and that was only cos my fella told me to get a test! i guess some women have that instinct and some don't. i didn't feel pregnant untill alot later. didn't have sickness, no signs, think i had the pregnancy bloom and didn't know it cos i felt great! not pregnant at all! i knew at 2 weeks with my 2nd but didn't feel pregnant again. although sickness came after a bit with my 2nd.
you've not said you've had any bleeding so i'm sure everthing's fine but you could talk to your midwife like jac says just to make yourself feel better. get your concerns out to stop yourself worring. don't sit around waiting for your next app. phone her. she'll not mind seeing you if that's what you need.