Withdrawal bleed question

Louise

So I came off my withdrawal bleed last Friday and the bleeding was the same as usual. Heavy on the second day following through till it dries out. But ever since then I have been having yellow discharge like this:

Or sometimes a little darker. Now this leads me to two questions. 1 is this anything to worry about? 2 because I had my withdrawal bleed on the right day and it was the same as usual does that mean I'm not pregnant?