Sterilizing?

𝔫𝔦𝔠𝔬𝔩𝔢⚢︎✰

Ok, so I bought the Lunette cup, boiled it for 20 minutes to sterilize it like the directions said, and used it. I'm not on my period anymore, so I'm confused on if I should sterilize it again. The instructions say that after you are done using it, you have to boil it for 20 minutes every time. I'm wondering if this is necessary, or if i could do the method where I would just do it for 5 minutes on the microwave. I found that you can do that to sterilize it. I also am in quarantine with my family, and I don't really want my dad to come in the kitchen and see me boiling a menstrual cup on the stove lol. Just wondering if it would sterilize it enough with microwaving it and that would be ok, or if I absorb have to boil it on the stove every time. Sorry this was so long btw.