Okay, I am a 12 year old girl who had their first period on September 9th, lasting for 6 days. I was wondering when I would get my second, and if there are any signs I should know about. I had brown discharge today, I've been very irritable and moody the past 4-5 days, and I've been having stomach aches and some light cramps. I've also had a headache small amounts at a time for the past 2 days. Are these signs? Thank you to anyone who responds!