sewing ? !!!

Wow..today in between playing with M. I was a actually able to sew a blessing dress and cape for my upcoming grandaughter !! Sandy gave us the pattern because it looks like something A. would love her baby to have !! My sewing machine started turning white thread black.. nice grey butttonholes on the back of the dress !! .I cleaned the bobbin case and it worked fine for about a minute before it did it again...so don't look too close...all the cape seams are grey and black...then, I got out my older Bernina[ a friend gave me ]and put on the trim with the same white thread ...but , oh, it is white !!