When you first begin to experience your mensturation cycle it will not come at regular intervals. However, over time this will even out and you will begin to have regular menstural cycles. As for the orangish color; when bright red blood mixes with cervical fluid it can appear an almost orange color with red flecks. Bright orange period blood can also be a sign of infection, however, so if you see it frequently, it has a foul odor, or it doesn’t also have a slippery consistency, see your doctor.