Pregnancy syptoms disappeared?

Hi ladies,

This is my second pregnancy and I'm hoping this little bean sticks. I miscarried at around 4-5 weeks last time. This time around, around the time of getting my positive I've been feeling the symptoms, then today I woke up at 5wks3 and I just feel fine. Boobs are hardly sore, no nausea today, hardly any cramping... (I know cramping isn't a good sign but my Dr reassured me that if it's light and intermittent with no severe aches or bleeding then it's cool.) I just don't feel pregnant today at all and I'm a little worried I'm having a silent miscarriage.

Is it normal for symptoms to fluctuate? Or should I call my Dr? I'm not sure if a scan this early would be able to confirm anything...