Haiz or istihaaza

Assalamualaikum Muftisaab

I have a question regarding my period. I started my first period at the age of 15 years old. My first period lasted for 10days. I have been very irregular in having it monthly. I sometimes only bleed after every 4 months. Most of the time I bleed for more than 10 days. Sometimes however, I get red discharge for 1 day n it goes away completely.

This year I had my period on the 1st of February until the 10th. After exactly 15 days,on the 25th of February I started bleeding again. However,I only bled for 2 days and the blood was not the colour or texture of my usual period blood. I would like to know what the masala is concerning my state of purity now. Am I suppose to carry on reading my salaat and quraan or am I suppose to wait out the 10 days then only make ghusal and first read my qadah salaat?

Am I experiencing istihaaza or is this my normal haiz?

Please can muftisaab explain to me the masala concerning my problem.

Jazakallah khairan