Girls, quick question — how do you collect a urine sample? My doctor s…

Girls, quick question — how do you collect a urine sample? My doctor scolded me today, said I collected it wrong and that there are bacteria. She said you need to wash first, insert a tampon, let a couple of drops out and only then start collecting into the cup. I used to give it differently before ) How do you do it? So many complications ) Why can't it be like before ) Sorry for such a question but I'm really curious