im 19 years old and my period came out weird. like it came a week before my period was suppose to come and my period came out blackish redish color. it only lasted about three days. so i guess form where my period was soppose to come, im six days late. latley i have been feeling very dizzy, bloated, have weired food cravings, having a lower back pain, having weird mood swings, and having to go pee more frequently. does this mean im preganat?