Not abnormal.
“However, depending on many factors including frequency of ejaculation, diet, general health, etc., the volume, consistency and color of the semen can vary. A yellow cast to the semen, as you have noted, is very common and a variation of normal. If you take multivitamins, this may be a cause.” From here.
I think that’s pretty normal. White to slightly “greyish” white is the usual color, but yellowish semen is not uncommon. There are rare times when semen can be streaked with a bit of bright red blood too. It doesn’t necessarily mean that there’s something wrong.