Dear Imran ; you need to purification your product .first check the TLC , then decide whether you you can make CC or extraction , or precipation methods .
Without knowing the structure, it is hard.... is chromatography an option? you have to consider that many compounds are NOT crystaline, or if they are, you might spend the next 6 month trying! good luck
Without the structure of this thiourea compound and without information on the reactants, its current appearance, its amount, and its potential impurities each answer to your question remains pure speculation.