When I wiped my va-j-j this morning there was blood but not in my underwear, have I started my period???

ANDY'S ANSWER: Yes, you have. It just hadn't leaked down to your underwear yet. You're lucky that you caught it right away.

A first period usually doesn't consist of a lot of blood, but you should at least wear a panty liner for a day or two to protect your underwear from staining.