Bleeding from nipple

I had a weird thing happened today. In shower I just squeeze my nipples a little to check whether anything comes from them like colostrum. There was nothing on left side and on right side even with little gentle squeeze there was brownish blood like liquid. It never happened before in first pregnancy or in general. There is no cracks on nipples or nothing happened like hit or anything but i am sure was from inside.

Anyone have any idea. I am not sure if I should check with doctor or that’s normal.

Btw will be 35 weeks on Saturday