What Causes Prolonged Periods After Taking Emergency Contraceptive Pills?

i had been prescribed noriday after my son was born, but after reading all the side effects i decided i would like to stay with just mayb my husband using condoms, but sometimes i would be scared i may get pregnant when he forgets to use a condom and i ended up having a pill the n stopped and then 2 days later my period atrt i had been doing this on and off for a yr nw, but the last time i did thiis was 2 weeks ago and nw my period doesnt stop fully for the past 2weeks now, what should i do, have i done something really bad to myself, have i damaged my body, i need some help.