Feeling like not pregnant very worry for no reason.

Hey ladies i found im pregnant on sunday and monday i did the test. Lately i've felt scared and feeling not pregnant... I see everyone bump is out there by 5 weeks and i feel my belly and touch i dont feeling anything and this point i felt scared and anxious and worry and stress i feel like crying.. This will be my baby 3 and i have 2 beautiful kids ... One i miscarried back in 91105 and i been traumatize and worry ever since i got pregnancy every pregnancy is different . has anyone felt like this im going nuts ! Share your stories thank you wonderful ladies.