Haiz, Istihaazah & Nifaas

Seeing a pinkish discharge before the days of haidh

Q: A woman spots pinkish discharge 5 days before her period date (she spotted the discharge on the 29th of November and she started bleeding on the 2nd of December) she does sometimes get her periods 3-4 days earlier, her normal habit is 10 days.

So my question is, should she count her Haidh from when she noticed the pinkish discharge or when she actually started bleeding?

Seeing little redness after one's haidh ends

Q: I had haidh for nine days but I thought it was 10 days and I made ghusl because I thought it will be istehaza.. Before performing ghusl I found it clear but immediately after that I found some reddish so I was not sure if it was completely clear or not but before performing ghusl it was clear. In confusion I performed ghusl anyway as I thought it was the 10th day. If I perform salah in this condition is my salah valid. After ghusl I performed asr and maghrib and I never checked during this time. After maghrib I checked and it was clear.. Is my salah valid? Or should I repeat them?

Irregular bleeding after a miscarriage

Q: I have 1 daughter who is 6 years old. And now I had a miscarriage on Dec 16... The bleeding followed for 13 days; 10 days haidh and 3 days istihadha. Then it was done.

On January 9, I started bleeding again. I took ghusl after 6 days on 16 Jan. On Jan 7 everything was clear and I prayed all my salaahs and on Jan 18 I suddenly started bleeding again. I took ghusl for that on Jan 19.

On Jan 28 I started bleeding again. It was just for an afternoon... Then on Monday Jan 29 verything was clear...

Today, Jan 30 I started bleeding again..

How do I calculate the days of haidh and the days of istihadha? This is really confusing for me. I have never had irregular menses since buloogh and my aadat has always been 5 days only.