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If you have consulted a doctor twice I assume he has ruled out any serious viral or parasitic or bacterial infection in your child . Most viral infections resolve within a week with supportive treatment ( Panadol
.But if the symptoms have not decreased after 3 days or seem to worsen and the repeat blood counts after 48 hrs show decreasing platelets then it should be a matter of concern and warrants further thorough evaluation to rule out specific infections ( like dengue
The doctor might then have to start appropriate antibiotic therapy as well.
So you may wait for a day or so but not more than that.
Hope this answer is helpful to you .
Wishing your child a speedy recovery.