Keep going; it is going to be gorgeous. I've done the same thing only my fabric isn't as pretty as yours!! As others have said, don't worry about the stripes matching. When the quilt is together, the "mistakes" (I choose to call them artistic decisions) have a way of disappearing.
I do have a tip, it you aren't already doing it. When sewing the pink quarter square triangles to the corner stripe squares, fold the square in half and finger press at the edge you will be sewing the triangle to. Fold the triangle in half on the side to be sewn to the square, finger press, match fold marks, pin, add pins as needed and sew. Press seam toward the triangle. Fold the square in half the other direction, finger press. Fold the other pink quartersquare triangle in half, finger press, match folds, pin and sew. Hope this is clear enough.