Missed Period - First time since December!

kristen
I had a miscarriage (MC) in November. From December - February I had a normal period. Last month it came on the 5th and left on the 9th. (Usually last 6days) I was due for my period last Friday (March 6) and I haven't had any spotting indicating its coming. When should I take a HTP to determine if its coming or not?