Hey I'm 21 years old.. I started my last period Jan 9-14 now today jan 31 I started again but it is really light and it's more pink then red. My breast have been sore the last 2 days and I've been moody and get a little sick.. I'm having minor cramps and lower back aches.. is there a possibility I could be pregnant.. this is unusually light. Thank you, Brandi