I’ve been noticing my mustache hair growing day by day, a few years ago there was only two or three hairs on each side, now there’s like 6 on each...?

Hormonal imbalance. You should consult your gynecologist for an evaluation. Polycystic ovary disease is a common disorder that can cause the problem you are experiencing. You may visit this site for information and discuss the issue with your doctor. https://www.mayoclinic.org/diseases-conditions/pcos/multimedia/polycystic-ovary-syndrome/img-20007768
Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex.
Get HPV vaccine.