Late period and stopping the pill

Hi all,

I stopped taking my pill on the 4th January and I normally come straight on my period 3/4 day’s later.

Me and my partner do have intercourse everyday maybe twice to three times a day, I’m now slightly concerned as we are now the 23rd January and I’ve still got no signs of a period... I done a test last week and it did come back negative?

What are your views??