Implantation

Guys, By the grace of God I’m 4weeks and 5days pregnant. However, I started to have some spotting which I did believe it was implantation bleeding. I read it lasts for about 1-2days. But I’m on my 3rd day now. Shd I worry? It started off as dark brown colour but now it’s a mixture of both pink and brown. I usually get this when I’m about to start my period.