Hi, well i'm 15 1/2 years old and i was suppose to start my period on the 21st of June. Then, in the afternoon, of the 30th, i had really light bleeding. Then today it seems a little heavier and darker. Usually my period lasts about 6 or 7 days and during the first 4 days it's really heavy. I've been having some signs of being pregnant, such as the sore breasts, nausea and vomiting, and some cramping. Should i take an at home pregnancy test or is there nothing to worry about? Please help i'm seriously confused about this. ANY advise at all with help greatly. And like i said, i'm only 15 1/2 years old! So please!