Brown discharge from 5 days. On time?

I took my blood reports on december 2022, My Thyroid is at  6.04 and doctor said i have pcos and told to reduce weight. I am 73  to 74. I have grown from 55 to 74kgs in span of 3 years. My problem is the period has to come on Aug 1st or July 29th atleast. I am under thyroid medication, but not on daily basis may be I take for 7 days a month. When I took the medicine for those days my dates used to come correctly. June 30th, June 1st, May 31st, May 1st, April-absent, March 30th. My sleep patterns was worst and on top of that for one month I was under mental stress. I don't understand from 5days onwards some spotting it looks like old blood in pale colour. And today that old one and red colour are seen together. will i get the periods on time? Or do I need to take the medication daily.