Hayd question

I have been experiencing irregular bleeding for several months now. It started after I had an IUD placed a few months after I had my third baby. It was like a light period for about one month and then it reduced to intermittent, but daily, spotting and discharge for almost 3 months. Now I still have intermittent spotting/discharge but not daily. It like every other day now. 

For the past 5 months since getting the IUD, (after speaking to an alima) I have been following 10 days Hayd, then 15 days of tuhr, then 10 days Hayd, so on. But my last Hayd was only 9 days. On the 10th day I did not have any discharge.( but on the 12th day I had some spotting) so now I am confused as to how to proceed. Do I count 15 days tuhr starting from that 9th day? 

Recently I learned about the ruling that we are supposed to revert to our Hayd and tuhr habits during istihadha so now I’m not sure if what I was doing was even correct. I am very confused what to do. 

Outside of pregnancy and postpartum, my periods were generally 8 days and my cycle varied from 31-35 days

After my first child I had about 3 weeks nifas, then no periods for 9 months. Then I had 4 periods with the same previous habit

Then I was pregnant with my second child. Nifas was 3-4 weeks. Then no periods for over one year. Then I had 1 period, then I was pregnant again with my third child. Nifas was right up to 40 days. No periods after that until IUD placement. 

April 1 2022 11:00 - IUD placed, bleeding started

9/11 12:05 am - present tuhr (brown/red/pink discharge once daily or every other day)

From my understanding, after 9/26 12:05 am, if I see any spotting, I will count it as Hayd. Is this correct?

Second question:

Does yellow discharge count as Hayd/istihadha? During my normal period days, towards the end I had brown/yellow discharge but I always eventually saw white discharge. Then I would take ghusl. 

In the Hayd logged below, I counted the end of Hayd at 9/11 12:05 - is that correct?

9/1 2pm -9/9 2:30 intermittent brown spotting 1-2 times daily

9/9 5pm, 11pm yellow discharge

9/10 7am yellow discharge, 12:45pm brown discharge

9/11 12:05 am yellow discharge, 9am white discharge, 12 pm white discharge 

I ask this because I am not sure whether to count yellow discharge as hayd, since I have yellow discharge quite regularly these days with my current irregular bleeding pattern. I learned that if yellow discharge is normal for you, then it does not count as hayd. But I also learned that if white discharge at end of period is normal for you, then to wait to see the white discharge before taking ghusl.