What constitutes a period?

I’d like 2 know, if a women rubs her finger inside the vagina, and touches the cervix and notices pink blood on the tissue, is it regarded as a period or do u have to wait till the blood flows down and when u just wipe to be regarded as a period?

In the Name of Allah, the Most Gracious, the Most Merciful.

As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh. 

The blood will be regarded as haidh only if it comes out by itself and is visible outside. In the inquired situation, the blood is still inside. It will not be regarded as haidh. ^[1]

And Allah Ta’āla Knows Best

Checked and Approved by,
Mufti Ebrahim Desai.

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منهل الواردين ص 122 دار الفكر[1]

خارج من فرج الداخل:احترازا عما لو احست بنزوله الي الفرج الداخل ولم يخرج منه فليس بحيض في ظاهر الروايه