I am new at Quilting...I have made a baby quilt and its ready to quilt. The top is light blue and assorted colors. Its made of squares with every other one white.. The back is dark blue. I tried stitch ni the ditch with white thread on top and blue on the bobbin. The blue shows thro mixed with the white on top. Should I use clear thread or is there somthing I am missing here? Also when you stitch in the ditch, do you press open the seams or press them to one side? I have my seams going to one side. Thanks for any help. Mary