It was the practice of the Prophet (peace and blessings be upon him):
"He (peace and blessings be upon him) did not take bad omens, but rather took good omens."
Hadith Referenceصحیح الجامع الصغیر / حرف الكاف / 4841
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[الحكيم البغوي] عن بريدة. الصحيحة ٧٦٢.