Pill newbie

Hi! I started taking pill (21-day combination) last Nov 2020, then I had my period. On Dec 2020, I missed my period, I only had brown spotting during my pill free week. On January 2021, I also missed my period, again, only brown spots during my 7 day pill free. Is this normal? I am sexually active since January 2021. One reason why I decided to go on pill because I planned to have sex for the first time and another reason is to treat my cystic acne due to PCOS. Another concern I have is that my appetite has increased when I took the pill.

Questions:

Will my increased appetite go away after some time?

Were the brown spotting normal?