Tampon sizes

Hello wonderful ladies, I am at a loss and wasn’t taught properly about periods from my mom and I don’t have sisters. I have had my period for many years now and I can tell my flow is getting heavier. When do you know it is time to increase to a bigger tampon size and how do you know what size to use!?

Please don’t judge because I don’t know this information just share helpful advice or move on. Thank you!