Tested negative until 6 weeks

M

Is this possible? I’m so confused. My last period was November 8th. I’ve been testing the past few weeks and all of them were negative. I tested today 3 times and got a faint positive all 3 times. I have to make a dr appointment obviously but does anyone have any idea how this could be possible? Unless I ovulated really late?? Chemical pregnancy maybe? But why wouldn’t I have tested positive sooner? I’m so lost. These all came up before the 3 minute time frame.