My HB low what should i take to make my HB ok.

On my 27 weeks pregnant my hb drop from 11.9 to 10.4.. then I try consume shaklee pregnancy set.. Alhamdulillah hb xpernah drop lagi sampailah hari ni.. naik je n terus maintain.. but my last hb before deliver was 16, quite shocking.. but semuanya still ok