Took a first response test this morning because my af is 5 days late and I've been having cramping for 4 days now, it came out bfn. I always have af less than 48 hrs after feeling cramps. So I reached up to check my cervix, and on my fingers came out globs of thick creamy white cm, and no pink whatsoever like there would prob be if my period was starting. Could this be a sign of pg? When should I test again?