Period. When it REALLY starts!

Amanda • I`m getting merried in Oct and my faience and i gave beet trying for a baby for a year so now I`m starting to really track everything in hopes that it helps
Ok I know this is a stupid question but because my faience and I are trying to have children I'm starting to pay more attention to my cycle. When do I put in that I have officially started? because for at least a week before I see the red blood I see brown mucusy clots (I guess you could call it)just little ones and brown thick and thin liquid with it. Now did I officially start when that starts or what is it? Because if that is my period it goes for a week and 5 days. I'm so confused please help