Okay so I'm confused as to what we count as our period ??

For example I bleed for 3-4 days red blood but then get brown/old blood for an extra 2 - 4 days??

My question is ... do we still count the old blood as a period or just the first couple of days when it's heavy and red?;

January I am trying to concieve and I need to make sure my flow is correct hehe! !

Thank you ladies ☺