Hi-I am 29 years old. Recently I expeienced some unexpected vaginal bleeding one week before my period was due to start. The bleeding came on the first time right before I went to bed. It was heavy, and had a few dark clots in it. The next day it was gone. I had my regular cyle. One week after my period another episode occured. I started bleeding out of no where. I expelled one large clot that time. That was the end. Why could this be happening, and should I be alarmed. Thank you.