验血报告如下,HCG有翻倍,但孕酮降低了.孕34天:HCG325.70mIU/ml;雌二醇485.0pg/ml;孕酮28.01ng/ml.孕36天:HCG 967.23mIU/ml; 雌二醇660.0pg/ml,孕酮27.33ng/ml.正常情况下孕酮会一直升吗?