Hi! My female lab is in her first heat. It's the 10th day of her heat today. Only today I could see a little mucus/ discharge in her urine this morning (opaque white mucus in 1st urine in the morning and then red after walk). Is this normal or could it be some infection? P.S. we got her vaginal cytology done on 5th which suggested that she was in proestrous phase of her cycle with no infection.