Don't know what's going on

Olivia

4 days late still no positive pregnancy test when I was pregnant with my first son I git a positive at 5 to 6 days late how late can you be before getting a positive my period was November 19th and I spotted very light pink on December 8-12 no cramps or blood clots with it now I'm 4 days late I was suppose to start the 17th but my periods are usually very heavy and lots of blood clots