Hi,
Welcome to ehealthforum,
It is difficult to comment on the altered bleeding that you describe without examining you and going ahead with further evaluation. The bleeding that you describe could be due to use of emergency contraception, hormonal changes, internal injuries, infections, endometritis etc. The exact cause can only be made out after thorough evaluation done by your doctor/gynecologist. Consider visiting your doctor/gynecologist at the earliest for further evaluation and assistance. Treatment as appropriate (based on the examination findings and investigation results) would be started to help you in regulating your periods. Drink plenty of water. Take adequate rest. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. If infective cause is detected, and if you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection.
Take care.