Welcome to Yorkie Talk.
Most males would be showing a lot of interest by now. Sadly some males are just never interested in breeding. Hopefully this is not the case with your male. I would advise that you completely separate your male and female and only allow them to be together when you are there to supervise the breedings. Most females can get pregnant anywhere from the 8th day to the 21st day but the most fertile time is usually from the 11th through the 17th day of the heat cycle. Please keep us posted on how things are going.