孕52天b超有胎心胎芽,孕囊2.4*1.6cm,胚芽1.0cm,孕酮18.7ng/ml,hcg105832.41mIU/mL。上次孕38天孕酮19.3ng/ml,hcg14937.07mIU/mL。请问需要服用黄体酮吗?