I am looking to buy my first cup but I'm unsure of what brand/size to get. I looked at the size chart and it was a bit confusing. I'm 18, a virgin. medium flow that lasts 5-6 days. I felt my cervix at about 6 - 6.5 cm (I checked while on my period) and I can fit 2 fingers in with no pain. Also, I live in the US and I noticed some you can't get here, so I don't know if that matters. And is it ok to wash with water and sterilize with rubbing alcohol after my cycle instead of boiling or is boiling a must?