There is no need to ask about bleeding. The probe itself may cause
irritation that could lead to light spotting. Since such bleeding would be from the vaginal wall and not the uterus, it would not make you
niddah.
Please write back with any further questions. You also may find it helpful to arrange a free consultation with a Yoetzet Halacha Fertility Counselor, details
here.
B’hatzlacha!
This response was updated on 3 May, 2021.