When did the IRS accept your return? You can get information on your return a day or two after it is accepted on WMR. Claiming head of household doesn't speed up or slow down your refund. According to IRS if you filed a correct return you should receive your refund within 21 days of being accepted.
If you have the EITC or ACTC credits then the IRS will start processing and updating information on WMR on 2/23/19. The earliest those refunds will be sent out is 2/27/19.